Research
The records behind a cash-paid health purchase
The recordkeeping rule does not name a document or a number of years. It sets a sufficiency standard and a materiality standard, and both of them are answered by what a record can establish rather than by how long it has been kept.
The statutory obligation is open-ended by design
The section that creates the obligation is one paragraph long and contains no list.
Every person liable for any tax imposed by the title, or for its collection, has to keep such records, render such statements, make such returns and comply with such rules and regulations as are prescribed from time to time.
A second sentence adds a power rather than a rule. Where it is judged necessary, any person may be required, by notice served on that person or by regulations, to make such returns, render such statements or keep such records as are deemed sufficient to show whether or not that person is liable for tax.
So the statute does not itself say what to keep. It delegates, and the content of the obligation lives in the regulations and in whatever notice is served.
This site does not give tax advice, and nothing here says what any reader should keep. What follows describes what the published rules say.
The sufficiency standard
The regulation supplies the general answer, and it is a standard rather than a schedule.
A person subject to tax under the relevant subtitle, or required to file a return of information with respect to income, has to keep such permanent books of account or records, including inventories, as are sufficient to establish the amount of gross income, deductions, credits, or other matters required to be shown by that person in any return of the tax or information.
Notice what the test measures. It is not whether a document exists or whether it looks official. It is whether the records are sufficient to establish the figures the return has to show.
The word "deductions" appears in that list explicitly, alongside gross income and credits, which is why the standard reaches expense records and not only income records.
A separate power lets specific records be required by notice served on a person, so the general standard can be supplemented in a particular case.
The regulation also states where the records have to be: kept at all times available for inspection by authorised officers or employees. Availability is therefore part of the obligation rather than an afterthought, and a record that exists somewhere unreachable does not answer it.
A parallel paragraph applies the same sufficiency idea to organisations exempt from tax, requiring permanent books or records sufficient to show specifically the items of gross income, receipts and disbursements. The pattern across the section is consistent: records are measured by what they can show.
The relaxation for wage earners, and what it does not relax
One paragraph moderates the general standard, and reading its scope carefully matters.
Individuals deriving gross income from the business of farming, and individuals whose gross income includes salaries, wages or similar compensation for personal services rendered, are required, with respect to such income, to keep such records as will enable the correct amount of income subject to the tax to be determined.
It is not necessary, with respect to such income, that those individuals keep the books of account or records required by the general paragraph.
The qualifier "with respect to such income" appears twice, and it confines the relaxation to the income side. The regulation points elsewhere for the records substantiating certain business expenses of employees.
The relaxation therefore says something narrow: a person whose income is wages does not have to keep formal books of account for that income. It does not address what is needed to establish a deduction, which the general standard already covers by naming deductions among the matters records have to be sufficient to establish.
For anyone whose only interest in this area is an expense claimed on a return, the general standard is the one that applies.
How long, expressed as a standard rather than a period
The retention rule is the shortest sentence in the regulation and the one most often summarised into something it does not say.
The books or records required by the section have to be retained so long as their contents may become material in the administration of any internal revenue law.
That is a materiality test, not a number of years. Nothing in the paragraph fixes a period, and no period is stated anywhere in this article, because the commonly repeated figures come from limitation provisions elsewhere in the code that were not read for this article.
The consequence of a materiality standard is that the answer varies with the record. A document's relevance can outlast the year it belongs to, and the rule anticipates that rather than cutting it off on a fixed date.
Anyone who needs a retention period for a particular situation should take it from the provisions that set limitation periods, or from a tax adviser, rather than from a comparison site.
What that means for a purchase made from an online seller
Putting the standards together produces a practical list, and every item on it is a fact a record has to be able to establish rather than a form to collect.
Who was paid, how much and on what date. The substantiation regulation for the medical expense deduction sets those out as an obligation to furnish, and a separate article on this site develops what that regulation asks for and why a payment receipt does not answer it.
What was supplied and for whom. That is the fact a payment record does not carry, and a separate article here sets out how little a payment receipt is actually required to contain.
Whether the expense was reimbursed, and from where. The published guidance on health savings accounts asks for records sufficient to show that distributions were exclusively to pay or reimburse qualified medical expenses, that those expenses had not previously been paid or reimbursed from another source, and that they had not been taken as an itemised deduction in any year. It adds that those records are not sent with a return but kept with the taxpayer's tax records.
When the expense belongs. The published guidance on medical expenses states that where a credit card is used, an expense is included in the year the charge is made rather than the year the balance is paid, and that where a pay-by-phone or online account is used, the date reported on the financial institution's statement showing when payment was made is the date of payment.
The last of those is a point about sequencing rather than paperwork. In a cash-pay category the party holding most of this information is the seller, and a seller that stops trading takes its records with it. This site covers that separately. Establishing what a seller will issue, and keeping it, is easier before a purchase than after one.
Key takeaways
- The statute delegates: it requires such records as are prescribed and allows specific records to be required by notice.
- The regulation sets a sufficiency standard, naming deductions alongside gross income and credits.
- The relaxation for wage earners is confined by its own words to their income.
- Retention is governed by a materiality standard, not by a number of years, and none is asserted here.
- Records have to be kept available at all times for inspection by authorised officers or employees.
- The facts a record has to establish are the payee, the amount, the date, what was supplied and whether it was reimbursed.
Frequently asked questions
What does the recordkeeping rule actually require?
The statute requires every person liable for a tax, or for its collection, to keep such records and render such statements as are prescribed, and allows specific records to be required by notice. The regulation supplies the general standard: permanent books of account or records, including inventories, sufficient to establish the amount of gross income, deductions, credits or other matters required to be shown on any return of the tax or information.
How long do records have to be kept?
The regulation states that records have to be retained so long as their contents may become material in the administration of any internal revenue law. That is a materiality standard rather than a number of years, and no period is asserted in this article. Figures commonly cited for record retention come from limitation provisions elsewhere that were not read for this article.
Does a wage earner have to keep formal books?
The regulation relaxes the general requirement for individuals whose gross income includes salaries, wages or similar compensation for personal services, and for individuals with farming income, but only with respect to such income. Those individuals have to keep records enabling the correct amount of income subject to tax to be determined, and are not required to keep the books of account described in the general paragraph with respect to that income.
What does the rule say about expenses rather than income?
The general standard names deductions explicitly, alongside gross income and credits, among the matters records have to be sufficient to establish. The relaxation for wage earners is confined by its own words to their income. Separately, the substantiation regulation for the medical expense deduction sets out what has to be furnished and what can be requested; a separate article here covers it.
What has to be shown about reimbursement?
The published guidance on health savings accounts asks for records sufficient to show that distributions were exclusively to pay or reimburse qualified medical expenses, that those expenses had not previously been paid or reimbursed from another source, and that they had not been taken as an itemised deduction in any year. It states that these records are kept with the taxpayer's tax records rather than sent with a return.
Which year does a card payment belong to?
The published guidance on medical expenses states that where a credit card is used, expenses charged to the card are included in the year the charge is made, not when the amount charged is actually paid. Where a pay-by-phone or online account is used, the date reported on the financial institution's statement showing when payment was made is the date of payment.
Sources
Each document below is named as it names itself, with the date printed on that document rather than the day it was read.
- United States Code Title 26, Section 6001, Notice or regulations requiring records, statements, and special returns — read in full, including the general obligation to keep such records as are prescribed and the power to require records by notice served on a person, 2024 Main Edition — Office of the Law Revision Counsel, U.S. House of Representatives, January 2025
- Title 26 Code of Federal Regulations Section 1.6001-1, Records — read paragraph (a) through paragraph (e), including the sufficiency standard at (a), the relaxation for farmers and wage-earners at (b), the power to require specific records by notice at (d), and the availability and retention standard at (e) — Electronic Code of Federal Regulations, Office of the Federal Register, August 1990
- Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans — read at Recordkeeping under Distributions From an HSA, for the three matters records have to be sufficient to show and the instruction to keep rather than send them — Internal Revenue Service, January 2025
- Publication 502 (2025), Medical and Dental Expenses, for use in preparing 2025 returns — read at What Are Medical Expenses for the rules on which year a payment belongs to, including the credit card and pay-by-phone or online account rules — Internal Revenue Service, January 2025