01
Why bookkeeping matters for gig income
Unlike W-2 employees, gig workers generally receive Forms 1099-NEC, 1099-K, or 1099-MISC with no federal income tax or self-employment tax withheld. As a self-employed individual you are taxed on your net profit, not gross income: Gross Income − Ordinary and Necessary Business Expenses = Taxable Profit (IRC §162). Without contemporaneous bookkeeping, deductible expenses are forgotten, mileage is under-reported, and the taxpayer ends up paying tax on gross revenue rather than actual profit.
02
Vehicle expenses — the largest deduction for most drivers
For rideshare and delivery drivers (Uber, Lyft, DoorDash, Grubhub, Instacart, Spark, Amazon Flex, Roadie), medical couriers, real estate agents, and mobile service businesses, vehicle expense is usually the biggest single deduction. The IRS allows two methods. Standard mileage: track business miles and multiply by the IRS annual rate, which already includes gas, oil, maintenance, repairs, tires, insurance, registration, and depreciation (parking and tolls remain separately deductible). Actual expense: deduct the business-use percentage of gas, oil changes, repairs, tires, insurance, registration, car washes, lease payments, depreciation, and the business portion of loan interest. Example: 15,000 business miles out of 20,000 total = 75% business use, so 75% of eligible actual expenses are deductible. Once a method is chosen for a vehicle, switching in later years is subject to IRS limitations.
03
Keeping a compliant mileage log
IRC §274(d) requires contemporaneous substantiation for vehicle expenses. A compliant mileage log includes date, starting location, destination, business purpose, beginning odometer, ending odometer, and total business miles. Apps like MileIQ, Everlance, Hurdlr, TripLog, and Driversnote automate this and create the audit trail the IRS expects. Reconstructing mileage at tax time from memory or app trip history alone is a common reason deductions get disallowed on exam.
04
Other commonly overlooked deductions
Cell phone: the business-use percentage of monthly service, data, and accessories (e.g., 70% business use = 70% deduction). Home internet: the business-use portion if the phone or laptop is used for scheduling, dispatch, or customer communication. Supplies: delivery bags, phone mounts, chargers, flashlights, office supplies, shipping and packaging materials, printer ink, labels. Equipment: computers, tablets, monitors, printers, cameras, specialized tools, software — some deductible immediately under §179 or bonus depreciation, others depreciated over time. Software: QuickBooks, Microsoft 365, Google Workspace, Canva Pro, Adobe Creative Cloud, mileage and scheduling apps. Merchant fees: credit card processing, PayPal, Stripe, Square. Advertising: business cards, website hosting, domain registration, online and social ads, logo design. Professional services: bookkeepers, tax preparers, attorneys, accountants, consultants. Education that maintains or improves current business skills. Home office: if a portion of the home is used regularly and exclusively for business under IRC §280A, deductible via the simplified method ($5/sq ft, capped) or actual-expense method on Form 8829.
05
Separate business finances and monthly close
Open a dedicated business checking account and business credit card, keep digital copies of receipts, and reconcile monthly. Waiting until tax season causes missing receipts, forgotten expenses, mileage estimates that fail §274(d) substantiation, and higher tax bills. Monthly bookkeeping lets you track income and expenses in real time, monitor profitability, and generate accurate financial statements before quarterly estimates are due.
06
Estimated taxes and record retention
Because taxes are not withheld from gig income, self-employed taxpayers generally must make quarterly estimated payments on Form 1040-ES covering federal income tax, self-employment tax (Social Security and Medicare under IRC §1401), and state income tax where applicable. Timely payments avoid the IRC §6654 underpayment penalty. Retain bank and credit-card statements, receipts, mileage logs, invoices, 1099s, accounting reports, and proof of electronic payments for at least three years after filing (or the due date, whichever is later) under IRC §6001 — longer for substantial income underreporting or bad-debt / worthless-securities claims.
