Self-employed taxpayers should keep timely records of all business income and expenses, plus source documents that identify the amount, date, payee or payer, business purpose, and any personal-use allocation. Maintain separate evidence for vehicle use, travel, meals, gifts, assets, home-office costs, payroll, and property basis when relevant. Reconcile records to bank, card, payment-platform, and filed-return totals, and retain them for the period that applies.
Important: This is general US federal recordkeeping information, not tax advice or a promise that an item is deductible. Tax treatment depends on current law and facts. Sources were reviewed on .
Start with the tax return, then work backward to evidence
The current Schedule C instructions say the form reports profit or loss from a sole-proprietor business and includes ordinary and necessary business expenses not deducted elsewhere. The instructions do not make every familiar category deductible in every situation.
For each reported total, preserve a path back to:
- the source document;
- the bank, card, cash, payroll, or payment-platform transaction;
- the business purpose and category decision;
- any allocation between business and personal use;
- the bookkeeping entry and return line;
- the person who made or reviewed the classification.
Income records
Keep invoices, sales records, deposit records, cash logs, payment-platform statements, Forms 1099, refunds, chargebacks, and records for income received without an information form. Reconcile gross receipts to bank deposits and explain transfers, loans, owner contributions, and other deposits that are not sales.
IRS Publication 583 lists supporting documents for gross receipts and says records should show the amounts and sources of business income. A Form 1099 is one input, not the complete ledger.
Ordinary operating expenses
For supplies, software, advertising, insurance, professional services, rent, utilities, fees, and similar costs, keep invoices or receipts, proof of payment, and enough information to show the business connection. Separate refunds, credits, sales tax, tips, and reimbursed amounts.
Publication 583 says supporting documents include sales slips, paid bills, invoices, receipts, deposit slips, and canceled checks and that they should be organized by year and type of income or expense. A statement or canceled check may prove payment without showing exactly what was purchased.
Mixed business and personal use
Keep a reasonable, repeatable basis for splitting the costs you share between work and life — a phone, internet service, equipment, a mixed purchase. Preserve the source bill and the worksheet or note explaining the percentage. Do not silently convert a personal expense into a business expense because the receipt was stored in a business folder.
When facts change during the year, record dates and the reason instead of applying one unsupported percentage retrospectively.
What that looks like in practice: you buy a phone in March and use it for both work and your family. The chain that survives a question is the invoice — scanned the week it arrived — the payment showing it cleared your account, a note from March saying how you arrived at the business share and what you based it on, the same percentage applied in your books, and the figure that ended up on the return. Five small pieces, each created the week it was true. Reconstructing them next spring from memory is the version that goes badly.
Vehicle, travel, meals, and gifts
These categories have detailed substantiation rules. Current Publication 463 discusses adequate records and documentary evidence for travel, gift, and car expenses.
- Vehicle: maintain timely mileage or use records with date, destination, distance, and business purpose, plus costs required by the chosen method.
- Travel: preserve dates, destination, business purpose, itinerary, lodging, transport, and the separation of personal days or companions.
- Meals: keep amount, date, place, business purpose, and business relationship or participants as applicable.
- Gifts: retain recipient, business relationship, description, date, cost, and purpose.
Do not rely on the under-$75 documentary-evidence passage as a universal exemption from records. It appears within specific Publication 463 rules, excludes lodging, and does not remove the need for an adequate record and business purpose.
Assets, equipment, and property basis
Keep purchase invoices, dates placed in service, business-use allocation, financing records, improvements, depreciation or expensing elections, and disposition documents. These records can affect more than the purchase year.
The IRS retention page says property records generally should be kept until the limitation period expires for the year of disposition because they support depreciation, amortization, depletion, gain, or loss. Do not delete an equipment receipt merely because the original card statement is old.
Home office and other fact-dependent categories
For a home-office position, preserve measurements, photographs or diagrams where appropriate, dates, use of the area, rent or ownership records, utility and insurance bills, repairs, and the calculation method. The evidence should show the facts used, not just the final number.
For education, insurance, retirement, health coverage, payroll, contractors, and entity-specific items, retain the plan, eligibility, invoice, payment, participant, filing, and business-purpose records relevant to the position. Ask a qualified professional which forms and rules apply instead of relying on a generic category list.
Electronic records need controls
The IRS recordkeeping guidance allows a system suited to the business when it clearly shows income and expenses. Publication 583 says electronic storage systems must provide complete and accurate records accessible to the IRS and are subject to controls and retention requirements.
- Capture complete source documents.
- Verify OCR and extracted amounts.
- Connect each file to the bookkeeping entry.
- Export from proprietary apps in common formats.
- Maintain independent backups and restore-test them.
- Document corrections rather than overwriting history without explanation.
Retention is not always three years
The IRS retention guidance lists a general three-year period and longer periods for certain omitted income, bad-debt or worthless-security claims, employment taxes, property basis, no return, and fraudulent returns. Apply the period to each record and check state, contractual, insurance, employment, and industry requirements.
Where ScanLens fits
ScanLens can capture source documents on iPhone, run OCR on-device, and export PDF or image files. It does not determine whether an expense is ordinary, necessary, substantiated, allocated correctly, or deductible. Keep the readable image and the accounting context.
Use the year-round receipt workflow, the digital-receipt rules, and the current App Store listing.
Bottom line
The best deduction record is a traceable chain from source document to transaction, business explanation, allocation, books, and return. Build that chain while the year is still happening. Let current tax law and qualified advice determine the deduction rather than asking a scan or category label to do it.
