Why Self-Employed People Underclaim Deductions
According to IRS Statistics of Income data on Schedule C utilization, the average self-employed person reports significantly fewer expense categories than the IRS expects given their industry — a gap that translates to thousands of dollars of unclaimed deductions per year. The cause is rarely the famous case of "no receipts." Most self-employed people have receipts. The actual cause is structural: they do not know which categories apply to their business, they do not capture expenses at the moment of purchase (which means they forget), and they fall back to round-number guesses at year-end that fail the IRS substantiation test if audited. The result is twofold: they pay more tax than they owe, AND they carry audit risk on the deductions they did claim because the records cannot back them up. The fix is process — capture every business expense the moment it happens, with the right category and a business-purpose note, and let the running total flow into your quarterly tax math automatically.
- IRS Statistics of Income data shows wide variance in expense reporting by industry — many sole proprietors report fewer categories than the industry baseline, suggesting underclaiming.
- Self-employment tax rate is 15.3% on the first $168,600 of net earnings (2024 limit; 2025 limit $176,100). A deduction reduces BOTH income tax AND SE tax, so a $1,000 deduction in the 22% federal bracket actually saves you $373 total: $220 income tax + $153 SE tax.
- IRS Pub 463 substantiation rules require contemporaneous record of: date, amount, place, and business purpose. "I remember" is not contemporaneous.
- The Cohan rule (Cohan v. Commissioner, 39 F.2d 540, 2d Cir. 1930) allows the IRS some discretion to allow reasonable deduction estimates without records — but the IRS has narrowed this aggressively in modern audits and you should not rely on it.
- IRS audit rates on Schedule C filers are higher than on W-2-only filers, especially for those reporting losses three years running (the "hobby loss" rule under IRC §183) and those with high cash-intensive businesses.
Schedule C Line by Line: Part II (Expenses)
Schedule C Part II is the expense section, with 26 numbered lines plus Part V "Other expenses." Each line corresponds to a specific category. Below is the line-by-line walk-through with the most common deductions that fit each category. This is not exhaustive — refer to IRS Pub 535 (Business Expenses) and Pub 334 (Tax Guide for Small Business) for the authoritative treatment. But it covers the deductions that account for the majority of self-employed expense dollars.
- Line 8 — Advertising: digital ads (Meta, Google, LinkedIn, TikTok), domain registration, hosting for marketing sites, business cards, SEO tools, content production for marketing, sponsorships, trade-show booths.
- Line 9 — Car and truck expenses: standard mileage method ($0.70/mile for 2025; 2026 rate published in late 2025 — verify on IRS.gov before filing) OR actual expense method (gas, oil, maintenance, registration, depreciation prorated by business use %). Cannot mix methods after the first year of the vehicle.
- Line 10 — Commissions and fees: payment processor fees (Stripe 2.9%, PayPal, Square), referral fees, affiliate commissions you paid to others, sales-rep commissions.
- Line 11 — Contract labor: payments to 1099 contractors. If you pay any single contractor $600+ in a calendar year, you must issue a 1099-NEC by January 31 of the following year (IRS Form 1099-NEC instructions).
- Line 13 — Depreciation: physical equipment with useful life > 1 year (computer, camera, vehicles, office furniture). Section 179 election allows immediate expensing up to $1,160,000 in 2023 / $1,220,000 in 2024 with phaseouts (IRS Pub 946). Most self-employed people use Section 179 to expense laptops, cameras, and equipment immediately rather than depreciating over years.
- Line 14 — Employee benefit programs: only if you have W-2 employees (1099 contractors do not count). For most one-person businesses, this line is $0 unless you have a spouse on payroll.
- Line 15 — Insurance (other than health): general liability, errors and omissions / professional liability, cyber insurance, business property insurance, business auto insurance (if not deducted on Line 9 via mileage method).
- Line 16 — Interest: 16a mortgage interest on business property; 16b other business loan interest (SBA loans, business credit card interest on business-only cards).
- Line 17 — Legal and professional services: attorney fees for business matters, CPA fees, tax-prep fees attributable to the business portion of your return, consultant fees, contract review.
- Line 18 — Office expense: office supplies and incidentals (paper, pens, printer ink, postage, shipping supplies) — small-dollar items that do not rise to the level of "depreciable equipment."
- Line 19 — Pension and profit-sharing plans: SEP-IRA contributions, Solo 401(k) contributions, SIMPLE IRA contributions. This is one of the highest-leverage deduction categories for self-employed people — see "The Five High-Impact Deductions Most Self-Employed People Miss" below.
- Line 20 — Rent or lease: 20a vehicles (if leased, not financed) and equipment; 20b real estate (office space, coworking space, storage units used for business).
- Line 21 — Repairs and maintenance: equipment repair, software maintenance contracts, building repairs (if you own a business-use building). Does not include routine vehicle maintenance under the standard mileage method.
- Line 22 — Supplies: consumables used directly in producing the product or service. Photographers: memory cards, backup drives. Bakers: flour, sugar. Consultants: workshop materials.
- Line 23 — Taxes and licenses: business license, professional license fees, state and local business taxes, real estate tax on business property, payroll taxes on employees (if any). Does not include federal income tax or self-employment tax.
- Line 24 — Travel and meals: 24a travel (airfare, hotel, ground transportation for business travel away from your tax home); 24b deductible meals (50% of meal costs while traveling for business or meeting with clients). Pub 463 has the rules.
- Line 25 — Utilities: business-only utility costs. If you use the simplified home office method (Line 30), you cannot also deduct home utilities here. Cell phone is partially deductible based on business-use percentage.
- Line 26 — Wages: W-2 wages paid to employees (1099 contractor payments go on Line 11). Most one-person businesses have $0 here.
- Line 27a — Other expenses: catch-all for legitimate business expenses that do not fit elsewhere. Software subscriptions are typically here, as are training, continuing education, professional dues, books and publications, conference fees, online course subscriptions, and miscellaneous business services.
- Line 30 — Expenses for business use of your home: simplified method ($5/sq ft up to 300 sq ft, max $1,500/year) OR Form 8829 actual-expense method. See "Home Office" deep-dive below.
The Five High-Impact Deductions Most Self-Employed People Miss
Across the Schedule C universe, five categories account for the vast majority of underclaimed deductions because they require process or planning that ad-hoc bookkeeping does not naturally produce. If you only learn to capture five categories well, learn these.
- Home Office (Form 8829 or Line 30 simplified). The simplified method gives you $5 per square foot of qualified business use up to 300 sq ft — $1,500/year maximum, no records of utilities required. The actual-expense method (Form 8829) is uncapped: prorate mortgage interest or rent, real estate tax, insurance, utilities, repairs, and depreciation by business-use percentage. For most home-based self-employed people, the actual method produces a 2x-5x larger deduction than the simplified method, but requires the substantiation. The qualifying test (IRC §280A): exclusive and regular use of a specific area for business as your principal place of business. A dedicated room or clearly-defined area qualifies; the kitchen table where you also eat does not.
- Vehicle Mileage. The IRS standard mileage rate for 2025 is $0.70/mile (IRS Notice 2024-08). The 2026 rate is announced in late 2025 — verify on IRS.gov before filing. For a self-employed person who drives 12,000 business miles in a year, that is an $8,400 deduction at $0.70/mile. Most self-employed people underclaim by 30-50% because they do not log miles contemporaneously — they reconstruct from memory at year-end, which fails the audit test. Use the standard method if your vehicle is paid off or you drive a lot of miles; use the actual method if your vehicle is expensive and lightly driven for business.
- Retirement Contributions (Line 19). The single highest-leverage deduction for self-employed people. A SEP-IRA allows you to deduct up to 25% of net self-employment earnings (capped at $69,000 in 2024). A Solo 401(k) allows the same employer contribution PLUS up to $23,000 employee elective deferral in 2024 ($30,500 if 50+) — for a combined max of $69,000 in 2024 ($76,500 with catch-up). A net-earnings $100K self-employed person can deduct roughly $25K via SEP-IRA or $48K via Solo 401(k), depending on plan structure. This is not bookkeeping minutiae; it is the single biggest tax move available to most self-employed people.
- Self-Employed Health Insurance Deduction. Goes on Schedule 1, not Schedule C — but every self-employed person eligible should be claiming it. If you (and not a spouse's employer plan) pay your own health insurance premiums, you can deduct 100% of those premiums above-the-line, reducing your AGI. Affects both federal and SE tax bases. Plan: $750/month premium = $9,000/year deduction = approximately $2,700 federal tax savings + $1,377 SE tax savings = $4,077 total tax reduction at the 22% bracket.
- Qualified Business Income (QBI) Deduction, Section 199A. Up to 20% of qualified business income, claimed on Form 8995 or 8995-A. Phases out above the income thresholds: single $191,950 in 2024 ($241,950 phaseout end); MFJ $383,900 in 2024 ($483,900 phaseout end). For service businesses ("specified service trade or business" — health, law, consulting, financial services, performing arts), the deduction phases out completely at the higher threshold. Critical for sole proprietors, partnerships, S-corps. Set to sunset after 2025 unless Congress extends — verify before relying on it for 2026 planning.
Pro Tip: These five deductions, claimed properly, can shift a self-employed person's effective tax rate by 5-15 percentage points. The single highest ROI on accounting time you can spend is making sure every one of these is captured systematically.
The Substantiation Rules: What the IRS Actually Wants
The substantiation standard for business expenses is set out in IRC §274(d) and IRS Pub 463 for travel, entertainment, gifts, and listed property; in IRC §280F for vehicles; and in the general "adequate records" standard for all other deductions. The common thread: contemporaneous record of business purpose. The IRS does not require you to keep records in a particular form, but it does require that records exist, that they document the date / amount / place / business purpose, and that they be created at or near the time of the expense. A bank statement showing "Office Depot $47.32" is NOT adequate substantiation — you also need the business purpose recorded somewhere (a memo on the receipt, an entry in your bookkeeping system, a note in your expense tracker).
- Date: when the expense was incurred. Bank statement date is usually adequate.
- Amount: dollar amount of the expense. Receipt or bank statement entry.
- Place: physical location or vendor where the expense was incurred. Receipt typically has this; bank statement has the vendor name.
- Business purpose: WHY this is a business expense. This is the field most self-employed people skip and the field the IRS most often challenges. "Office supplies for marketing materials" beats "Office Depot." "Client lunch with Acme Corp prospect" beats "Restaurant Smith."
- Receipt threshold: IRC §274(d) requires receipts for expenses of $75+ for travel, entertainment, and gifts. Below $75, a contemporaneous record (your expense tracker entry) is sufficient. But best practice: capture every receipt regardless of amount.
- Mileage substantiation: a contemporaneous log with date, business destination, business purpose, and miles driven. A reconstructed-from-memory log at year-end will not survive an IRS audit. Mileage apps (or WealthWise's manual mileage entry that timestamps the entry) provide contemporaneous logs.
- The "I lost my receipts" problem: the IRS may apply the Cohan rule (allowing reasonable estimates) but increasingly will disallow deductions outright without records. Banks often have 7+ years of statement history available — pulling them as backup is worthwhile, but does not satisfy business-purpose substantiation.
Home Office Deduction: Simplified vs. Actual Method
For most home-based self-employed people, the home office deduction is the second-largest single Schedule C deduction after retirement contributions. The IRS allows two methods (IRS Pub 587), and you choose annually — there is no penalty for switching between them year-to-year. The simplified method is faster but caps your deduction at $1,500/year. The actual-expense method requires Form 8829 and substantiation but is uncapped and frequently produces 2x-5x the deduction.
- Qualifying test (IRC §280A): exclusive and regular use of a specific area for business AS YOUR PRINCIPAL PLACE OF BUSINESS, or for meeting with clients in the normal course of business, or in a separate structure used for business. The "exclusive use" test is strict — a guest bedroom that doubles as your office during the day disqualifies you for both uses combined.
- Simplified method (introduced 2013): $5 per square foot of qualifying use up to 300 sq ft, maximum $1,500/year. No depreciation, no recapture on sale of home, no Form 8829, no utility tracking. Best for: small home offices, people who do not want the paperwork, or those with low actual home costs.
- Actual-expense method (Form 8829): prorate direct expenses (100% deductible) and indirect expenses (deductible by business-use percentage). Direct: paint job on home office, repairs specific to the office. Indirect: mortgage interest, real estate tax, homeowners insurance, utilities, repairs and maintenance, depreciation (residential, 39-year for office portion via Form 4562). Business-use percentage = (office sq ft) / (total home sq ft). 100 sq ft office in 1,000 sq ft home = 10% business use.
- Example: 100 sq ft office in 1,000 sq ft home with $36,000/year in indirect costs (mortgage interest + tax + insurance + utilities + repairs) plus $3,000/year depreciation on the office portion. Simplified method: 100 × $5 = $500. Actual method: ($36,000 × 10%) + $3,000 = $6,600. Difference: $6,100 additional deduction = ~$2,275 tax savings.
- Recapture warning: actual-method depreciation reduces your home's basis. When you sell, the depreciated amount is "unrecaptured section 1250 gain" taxed at up to 25%, even if the home sale qualifies for the §121 personal residence exclusion. Plan for this if you intend to claim the actual method.
Pro Tip: If you have a real dedicated home office and your home costs more than $30K/year in indirect expenses, the actual method probably beats simplified by $3-8K of deduction per year. Run the math both ways at year-end.
Vehicle Deductions: Standard Mileage vs. Actual Expense
Vehicle deductions are the third-largest Schedule C category for many self-employed people, but the rules are more complex than they appear. The IRS allows two methods (IRS Pub 463), and the choice in year one of the vehicle locks you out of the other method for that vehicle. Standard mileage is simpler and usually wins for paid-off vehicles or high-mileage business use. Actual expense is more complex but wins for newer or more expensive vehicles with moderate business use.
- Standard mileage method: $0.70/mile for 2025 (IRS Notice 2024-08). 2026 rate announced in late 2025; verify before filing. Covers gas, depreciation, maintenance, repairs, insurance, registration — everything except parking, tolls, and lease/loan interest, which are separately deductible.
- Actual expense method: prorate gas, oil, maintenance, repairs, insurance, registration, depreciation (or lease payment) by business-use percentage. Business-use % = business miles / total miles for the year. Requires a logbook of all miles, not just business miles.
- Vehicle-year-one election: in the first year you use a vehicle for business, you choose standard OR actual. If you elect standard in year one, you can switch to actual later. If you elect actual in year one, you are LOCKED into actual for the life of the vehicle.
- When standard usually wins: paid-off vehicles, high-mileage business use (10,000+ business miles/year), vehicles with relatively low purchase price.
- When actual usually wins: expensive vehicles (Section 179 or bonus depreciation can front-load deduction), moderate business-use percentage with high actual costs (luxury vehicles, hybrids/EVs with high fuel-equivalent costs), newer vehicles with significant depreciation.
- Substantiation: contemporaneous mileage log with date, business destination, business purpose, miles. WealthWise allows manual mileage entry that timestamps each log entry; the timestamp is the contemporaneous evidence.
Retirement Contributions: The Highest-ROI Deduction Self-Employed People Have
For most self-employed people, retirement-account contributions are the single highest-leverage tax move available. A $20,000 SEP-IRA contribution in the 22% bracket saves roughly $7,500 in tax ($4,400 federal income + $3,060 self-employment) — meaning $20K into retirement actually costs you $12,500 of net spending power. The same dollar invested over 30 years at 7% becomes $152,000. This is not optional accounting minutiae; it is the most important annual decision a self-employed person makes after pricing their work.
- SEP-IRA: deduct up to 25% of net self-employment earnings (after the SE tax deduction), capped at $69,000/year in 2024 ($66,000 in 2023). Simple to set up, contributions can be made up to the tax-filing deadline including extensions (October 15 for sole proprietors who file Form 4868). Best for: sole proprietors with no employees who want maximum simplicity.
- Solo 401(k): combines a 25% employer contribution (same as SEP) with a $23,000 employee elective deferral in 2024 ($30,500 with the 50+ catch-up), totaling up to $69,000 ($76,500 with catch-up). Must be established by December 31 of the contribution year (employee deferrals); employer side has the same October 15 deadline as SEP. Best for: sole proprietors who want the maximum dollar amount of tax-deferred contributions, or who want Roth treatment on the elective deferral portion.
- SIMPLE IRA: deduct up to $16,000 employee elective deferral in 2024 ($19,500 if 50+), plus a 2-3% employer contribution. Lower limits but very simple. Best for: very-low-income self-employed people for whom the simplicity outweighs the lower cap.
- Traditional IRA: deduct up to $7,000 in 2024 ($8,000 if 50+), with income-based phaseouts if you (or spouse) have a workplace retirement plan. Best for: low-income self-employed people who do not want to set up a SEP or Solo 401(k).
- Backdoor Roth IRA: high-income self-employed people whose AGI exceeds the direct Roth contribution limits can contribute to a Traditional IRA and convert to Roth. Not deductible (this is a Roth strategy, not a Schedule C deduction), but worth flagging because retirement-planning context drives the SEP/Solo 401(k) decision.
Pro Tip: Solo 401(k) typically beats SEP-IRA for self-employed people earning $50K-$200K because the $23K employee deferral on top of the 25% employer contribution lets you front-load tax-deferred savings without needing higher income to hit the cap.
Self-Employed Health Insurance and the QBI Deduction
Two non-Schedule-C deductions deserve mention because they are routinely missed by self-employed people and have substantial dollar impact. Both flow through to your Form 1040 rather than to Schedule C, but they originate from self-employment status and should be tracked alongside your Schedule C numbers.
- Self-Employed Health Insurance Deduction (Schedule 1, Line 17). Deduct 100% of health insurance premiums paid for yourself, spouse, and dependents — provided you (or your spouse) were not eligible to participate in a subsidized employer health plan during the month. Above-the-line, so it reduces AGI (and therefore reduces both federal income tax and SE tax indirectly via the SE tax base). Maximum deduction: limited to your net self-employment earnings. Self-employed family of four paying $1,800/month for an ACA marketplace plan = $21,600/year deduction.
- QBI Deduction (Form 8995 or 8995-A). Up to 20% of qualified business income, taken as a deduction against AGI. Phases out above income thresholds for "specified service trade or business" (SSTB) categories: single $191,950 in 2024 ($241,950 phaseout end); MFJ $383,900 ($483,900 end). Non-SSTB businesses get the deduction without phaseout but subject to W-2 wage / UBIA limits above the threshold. Set to sunset after 2025 unless Congress extends.
- Combined effect: a self-employed person with $100K of Schedule C net income, $9,000 of self-employed health insurance, and $25,000 of SEP-IRA contributions has a Schedule C net of $100K reduced by $25K SEP to $75K, AGI further reduced by $9K SE health to $66K, then QBI deduction of $13,200 (20% × $66K, simplified) — taxable income of approximately $52,800 from a $100K gross. This is the structural reason high-income self-employed people pay lower effective rates than W-2 employees at the same income — and the structural reason underclaiming any of these deductions is so expensive.
The Receipt-to-Deduction Workflow That Actually Works
The single most important habit for self-employed tax savings is contemporaneous receipt capture. Every receipt photographed at the moment of purchase, with the business purpose noted, with the right Schedule C category assigned, is a deduction that survives audit. Every receipt that ends up in a shoebox is a deduction at risk. The workflow below is what WealthWise OS is built to deliver, and what you can approximate with manual tools if you do not use WealthWise.
- Step 1: capture the receipt at the moment of purchase. Phone camera, dedicated app, or — best — a receipt scanner with AI extraction. WealthWise's receipt scanner uses Google Gemini Vision to extract vendor, amount, date, and itemized line items in under 30 seconds per receipt.
- Step 2: tag the business purpose. "Client lunch with [name] discussing [project]." "Camera equipment for [project name] shoot." "Supplies for [event] booth." 8 words is plenty; what matters is that the WHY is in writing.
- Step 3: assign the Schedule C line. Office supplies → Line 18. Software subscription → Line 27a. Mileage → Line 9. WealthWise suggests the line automatically based on vendor and content; you confirm or correct.
- Step 4: apply the business-use percentage if mixed-use. A laptop you use 80% for business is 80% deductible. A cell phone bill that is 60% business is 60% deductible. WealthWise lets you set per-category default percentages and override per-receipt.
- Step 5: the running total flows into your quarterly tax estimate. As deductions accumulate, your projected Q1 / Q2 / Q3 / Q4 payment recalculates immediately. No surprises at quarter-end.
- Step 6: at year-end, export the categorized expense report by Schedule C line. WealthWise's CPA Export Package includes this categorized expense report, 1099 income summary, mileage log, and prior-year comparison — a clean handoff to your tax preparer or DIY filing software.
When to Hire a CPA
A common question from self-employed people: when does it make sense to hire a CPA vs. filing yourself with TurboTax Self-Employed, FreeTaxUSA, or an equivalent DIY tool? The honest answer depends on the complexity of your tax situation, not on your gross revenue.
- Hire a CPA if: you are an S-corp or LLC taxed as an S-corp (reasonable compensation analysis matters), you have employees on payroll, you have significant K-1 income from partnerships or other pass-throughs, you have a multi-state nexus issue, you have international income or expenses, you have crypto transactions in volume, or you have had any IRS correspondence in the past three years.
- DIY with software if: you are a single-member LLC or sole proprietor, you have only US-source self-employment income, you have a manageable number of expense categories, you have organized records (which the receipt-to-deduction workflow above produces), and your situation is similar to last year's. TurboTax Self-Employed (~$129), TaxAct Self-Employed (~$70), FreeTaxUSA Premium ($7.99 federal + $14.99/state) all handle a clean Schedule C well.
- WealthWise + CPA stack: $99 WealthWise Pro for the year-round tracking and AI advisor + $300-1,500/year for the tax preparer who actually files. The CPA appreciates clean records; you save 8-15 hours of year-end shoebox sorting.
- WealthWise + DIY stack: $99 WealthWise Pro + $129 TurboTax Self-Employed at filing time = $228/year total. Cheaper than QBSE + TurboTax bundle alone, with the AI advisor and personal-finance integration added.
The Honest Bottom Line
Self-employed people leave tens of thousands of dollars on the table every year not because they cannot find deductions but because they do not have a process for capturing them. The IRS allows a wide universe of legitimate business deductions — 26 numbered lines on Schedule C, plus retirement contributions, plus self-employed health insurance, plus the QBI deduction. Most are claimed only partially because they require systematic capture, substantiation, and category assignment that ad-hoc bookkeeping does not produce. The fix is process: capture every expense at the moment it happens, tag it with the business purpose, assign the right category, and let the running total flow into your quarterly tax math. This is what WealthWise OS is built to deliver — receipt scanning with AI extraction, Schedule C category suggestion, business-use percentage application, and real-time quarterly tax tracking, all in a $99/year product designed specifically for the self-employed.
- Audit your last 12 months of bank and credit card statements for business expenses you forgot to claim. Most self-employed people find $3,000-$15,000 of unclaimed deductions on a single pass.
- Set up a SEP-IRA or Solo 401(k) before the tax-filing deadline (October 15 with extension) — this is the single highest-ROI tax move available to most self-employed people.
- If you have not been tracking mileage contemporaneously, start today. You cannot reconstruct prior months from memory and survive an audit, but you can capture every mile from this point forward.
- If you have not been claiming the home office deduction, run the math both ways (simplified vs. actual) for your current setup. The actual method usually wins for dedicated home offices.
- If you want to try WealthWise without committing: the free tier has all calculators, the AI advisor (capped at 20 messages/month), and basic budget / debt / FIRE modules with no time limit. wealthwiseos.com/signup.
Pro Tip: The single highest ROI on accounting time you can spend is making sure every legitimate deduction is captured systematically. Process beats heroics — and AI-assisted capture turns process into something that takes 30 seconds per receipt instead of 30 minutes per audit.
Sources & Further Reading
Every claim in this post is sourced. Tax figures verified from IRS publications and notices as of May 10, 2026. Confirm current-year figures on IRS.gov before filing, especially for figures that change annually (mileage rate, SEP/Solo 401(k) limits, QBI thresholds, SE tax wage base).
- IRS Schedule C (Form 1040) and instructions: https://www.irs.gov/forms-pubs/about-schedule-c-form-1040
- IRS Publication 334 — Tax Guide for Small Business: https://www.irs.gov/publications/p334
- IRS Publication 463 — Travel, Gift, and Car Expenses: https://www.irs.gov/publications/p463
- IRS Publication 535 — Business Expenses: https://www.irs.gov/publications/p535
- IRS Publication 587 — Business Use of Your Home: https://www.irs.gov/publications/p587
- IRS Publication 946 — How To Depreciate Property (Section 179, bonus depreciation): https://www.irs.gov/publications/p946
- IRS Notice 2024-08 — Standard Mileage Rates for 2025 ($0.70/mile business): https://www.irs.gov/pub/irs-drop/n-24-08.pdf
- IRS Form 1099-NEC instructions ($600 contractor threshold): https://www.irs.gov/forms-pubs/about-form-1099-nec
- IRS Schedule SE (Form 1040) — Self-Employment Tax: https://www.irs.gov/forms-pubs/about-schedule-se-form-1040
- IRS Form 8829 — Expenses for Business Use of Your Home: https://www.irs.gov/forms-pubs/about-form-8829
- IRS Form 8995 — Qualified Business Income Deduction: https://www.irs.gov/forms-pubs/about-form-8995
- IRS Statistics of Income — Sole Proprietorship Returns: https://www.irs.gov/statistics/soi-tax-stats-sole-proprietorship-statistics
- Cohan v. Commissioner, 39 F.2d 540 (2d Cir. 1930) — substantiation standard origin case: https://scholar.google.com/scholar_case?case=10595569413117830900
- Upwork Freelance Forward 2023 — 64 million American freelancers: https://investors.upwork.com/news-releases/news-release-details/upwork-study-finds-64-million-americans-freelanced-2023-adding