Monthly or Quarterly Bookkeeping: How Often Your Books Need Doing

Does the IRS require me to do my books every month?

No bookkeeping schedule appears in the IRS recordkeeping pages. The IRS asks for a system that clearly shows income and expenses. Publication 583 advises recording transactions daily as a general practice and reconciling the business checking account each month. Closing a period means every transaction is sorted and each account in the books matches its statement.

The pace a business needs comes from its due dates: estimated tax, payroll deposits, sales tax returns and year-end forms. A business with only estimated tax to meet can often work from a quarterly review timed to its payments. A business with employees generally cannot, because a deposit is usually due inside each month. A sales tax account sets the pace by the filing period the state assigns. With no payroll, sales tax return or lender, and an individual's estimated payments set from last year's tax, the first date that needs the year's figures is February 1, 2027 for contractor forms, or the return itself if none were paid; a yearly close can meet those dates, though Publication 583 still advises reconciling monthly.

A case is not simple if the business has employees, collects sales tax, holds inventory, sells on several platforms, or reports to a lender or investor. It is also not simple if you hold a low quarterly or yearly quote and cannot tell whether it covers your payroll, sales tax and estimated tax dates, or if year end keeps turning into a scramble; the quote questions below cover that. Gather before deciding: twelve months of bank and card statements, payroll reports, the last filed return, and each state's sales tax filing schedule.

Which dates force my books to be current?

Four kinds of dates force the books to be current: estimated tax payments, payroll deposits and returns, year-end forms, and sales tax returns. Each can need a number from the books before the date, not after it. A federal date on a weekend or legal holiday moves to the next business day (IRS).

The IRS employment tax page lists the payroll dates, and the Form 1099 page sets the contractor threshold, and the 1099-NEC instructions list the exceptions. Estimated tax is explained under its own heading below. For which sales tax dates apply, see filing sales tax returns.

These are federal dates. A state may set its own estimated tax split and its own payroll withholding and unemployment dates; California, for example, does not split individual estimated tax into four equal parts (FTB).

Is quarterly bookkeeping enough for a small business?

Quarterly bookkeeping can be enough when no payroll, sales tax or lender date falls between closes and income is steady. It is not enough when any date in the table above arrives before the next scheduled close.

A calendar-quarter close can be too late to pay a lower annualized installment on time. For individuals the IRS payment periods end March 31, May 31, August 31 and December 31, so a close that waits for June 30 or September 30 comes after the June 15 and September 15 payments are due (IRS). Books finished later can still support the method when the return is filed, if each transaction is dated correctly (Form 2210 instructions). Payments set from last year's tax or from expected income for the whole year do not need books dated to those days. Whatever the schedule, a close helps only if it is finished before the payment it informs.

For who should do the work, see doing your own books or hiring a bookkeeper.

What do I need current before each estimated tax payment?

What is needed depends on how the payment is set. A payment set from expected income for the whole year (Publication 505) needs no books dated to a period end, though a year-to-date profit figure keeps that estimate current. A payment set from last year's tax needs only last year's return. The annualized method needs income dated to each period end: known at the time to pay less, or rebuilt from dated books when the return is filed.

Source: IRS estimated tax FAQs. Individuals, including sole proprietors, partners and S corporation shareholders, generally pay when they expect to owe $1,000 or more at filing. A partnership generally does not pay tax on its income; its partners do, including estimated tax (IRS). An individual who files the year's return by February 1, 2027 and pays the whole balance with it can skip the January 15, 2027 payment (Form 1040-ES), which rewards closing the year early.

A corporation expecting $500 or more pays on the 15th day of the 4th, 6th, 9th and 12th months of the tax year (Form 1120 instructions). It can pay by last year's tax if that year covered 12 months and showed tax, unless it is a large corporation ($1 million or more of taxable income in any of the 3 prior years), which can do so for its first installment only. If it uses the annualized method, the standard periods end at months 3, 3, 6 and 9 of its tax year, so for a calendar-year corporation a close at each quarter end fits; an officer elects other periods on Form 8842 by the first installment's due date (Form 2220 instructions; Form 8842).

An individual has three ways to set the payments, each with its own need for books:

• Last year's tax. The IRS lets most individuals avoid the underpayment penalty by paying at least a set share of last year's tax, if that return covered 12 months (IRS), so this needs no current books. It only avoids the penalty: if income rose, the balance is still due at filing, and the books show how much cash to set aside.
• This year's income. The target is figured on expected income for the whole year and, if income is about the same all year, paid in four equal installments (Publication 505). A year-to-date profit figure at each period end keeps that estimate current.
• The annualized method. Seasonal income or a large late gain can lower an installment. It uses income and deductions from January 1 through March 31, May 31, August 31 and year end, figured by the business's accounting method, and a partner or S corporation shareholder includes a share of the entity's items for each period. The annualized income schedule of Form 2210 figures it and is filed with the return, so dated books finished later can supply the figures; a close before each payment lets the lower amount be paid on time (Form 2210 instructions).

For how much to pay and how the penalty is figured, see quarterly estimated tax payments.

What changes once I have employees or collect sales tax?

Employees usually put a deposit date inside every month, which generally makes a monthly close the minimum. A very small payroll can be an exception: when the Form 941 tax for the current or prior quarter is under $2,500 and no next-day deposit applies, that tax may be paid with the return instead of deposited, though when the quarter's total is uncertain Publication 15 says to deposit. An employer the IRS approves for Form 944 (annual tax of $1,000 or less, requested in the first calendar quarter of the year) files once a year (Publication 15). A sales tax account puts a return date on every period the state assigns, so the filing frequency sets the close.

For a Form 941 filer, the deposit schedule comes from the tax reported on Form 941 in the four quarters from July 1 two years back to June 30 of last year. It does not depend on how often employees are paid (Publication 15).

Form 941 follows each quarter on the last day of the first month after each quarter, with 10 more calendar days when every deposit was made on time (IRS). A late deposit draws a penalty of 2% to 15% of the unpaid amount, set by the days late and, for the top rate, by when IRS notices arrive (IRS). A responsible person, such as an owner, an officer or anyone who controls which bills are paid, who willfully fails to pay over withheld tax can owe 100% of the unpaid amount personally (section 6672; Publication 15), generally assessed within 3 years of the April 15 after the payroll year, with no limit while a return is unfiled (IRM 5.7.3). For missed deposits, see behind on payroll taxes and trust fund recovery penalty. If a payroll provider was to make the deposits and did not, see payroll provider did not pay your taxes.

A state assigns each registered business a sales tax filing frequency, generally from sales or tax volume, and requires a return for every period even with no sales. California and New York each assign monthly, quarterly or yearly filing, and California's quarterly prepay filers also prepay inside each quarter. A marketplace that collects tax on orders it facilitates does not end a registered seller's returns; New York has the seller report those sales as nontaxable and keep the marketplace's certificate and the sales records (New York). Check the state's assignment before choosing a close schedule; see filing sales tax returns.

What does it cost to leave everything until year end?

Waiting costs the penalties that in-year dates already carry, plus the work of matching twelve months of statements at once. The costs the IRS sources name:

• Estimated tax. The penalty rests on the amount underpaid, how long it stayed unpaid, and the IRS's published quarterly underpayment rates (IRS). It is figured separately for each due date, so a late payment is not cured by paying more later (Form 2210 instructions).
• Year-end forms. A W-2 or 1099-NEC that is late or missing draws a penalty per form (W-2 instructions; 1099 instructions); see late contractor and employee tax forms.
• Records made late. A cash payment with no receipt should have an explanation in the records at the time of payment (Publication 583). For travel, gift and car expenses, a timely kept record has more value than a statement prepared later, and a weekly log counts as timely (Publication 463).

The IRS says to keep records as long as needed to prove the income or deductions on a return (IRS), so a charge nobody can account for may be a deduction with no proof. See penalties for not keeping business records and lost receipts for business expenses. If the books are already months behind, see catching up on overdue books.

How do I stay on top of categorizing expenses without it eating my week?

Split the work: a short weekly pass to sort transactions, and a fixed monthly date for the matching. Publication 583 supports the habits below; the schedule is a working suggestion, not an IRS rule.

1. Keep business money in its own account. Publication 583 says to keep the business account separate from the personal one, and suggests marking each deposit as business income, personal funds or a loan (Publication 583).
2. Sort new transactions each week. Categorize what is clear, and flag the rest for whoever closes the books. Record expenses when they occur (Publication 583).
3. Save each receipt the day it arrives. For a cash payment with no receipt, write the explanation at once.
4. Download every monthly statement when it posts. Statements are what a reconciliation matches against (Publication 583).
5. Send payroll reports and sales tax filings to the person keeping the books after each payday and each filing.
6. Make sure someone reconciles every month. A bank feed imports transactions but does not check them against the statement; see bank feeds are not reconciliation.

For what a full monthly close covers, see the month-end close checklist. For a simple receipt system, see record keeping for the self-employed.

When do lenders or investors expect monthly books?

When the loan or investment agreement says so. No tax rule sets this; the agreement sets how often statements are due and how many days after period end.

Read the reporting clause for four things: the frequency (monthly, quarterly or annual), the deadline after each period, whether an accountant must prepare the statements, and the basis (cash or accrual). A business that must deliver monthly statements within a set number of days needs a monthly close even if no tax date does. For what each reader asks for, see monthly financials for investors and the board, financial statements for a bank loan and proving income to a lender.

How do I judge a cheap quarterly or yearly bookkeeping quote?

A low quarterly or yearly price compares with a monthly one only when the scope is the same: which dates it closes, what it reconciles, and what it leaves out. Divide the price by the months and by the transactions it covers, then ask:

Whether a yearly or quarterly price is good depends on those answers, not on the number alone. A low price can fit a business with few accounts and no payroll or sales tax. It is a poor fit once the filing dates above apply and the quote does not name them. For what a comparable quote must state, typical monthly fees and what drives them, see what a bookkeeper costs each month and what a monthly bookkeeping service includes.

Example

These examples are illustrative and use US dollars.

A freelance designer with no employees

A designer has US$90,000 of revenue, about 40 transactions a month, no employees and no sales tax. The designer closes the books through March 31, May 31, August 31 and December 31, each finished before the estimated payment that follows. About ten minutes a week of categorizing keeps each close short. If income is steady, last year's tax can set the payments, and the books show how much to set aside for the balance. If one large project lands in a single period, the dated books support the annualized method.

A restaurant LLC with six employees

A restaurant LLC has six employees and files sales tax monthly. Assume its payroll tax is above US$2,500 a quarter, so it deposits rather than paying with the return. If it is a monthly depositor, March wages are deposited by April 15, and the March sales tax return follows on the state's date. March's payroll and sales figures must be ready in early April, so a monthly close is the usual minimum. If its lookback tax was above US$50,000, it deposits within days of each payday, and payroll needs checking every pay period.

An online seller who waits until December

An online seller has 800 orders a month across three platforms, about 9,600 orders a year, each with its own fees, refunds and payout date. Starting in December means matching twelve months of payouts at once. A US$1,000 yearly quote is about US$83 a month. Unless it says it reconciles the payouts, covers sales tax by period and includes the cleanup, the price may buy sorting transactions only.

Different for you?

• You hold a low quarterly or yearly quote, or year end keeps turning into a scramble: the right schedule depends on your payroll, sales tax and estimated tax dates, and on what the quote leaves out. Work out which dates your business must close for, and what a fitting schedule includes, with bookkeeping help.
• Your books are already months behind: see catching up on overdue books and catch-up bookkeeping cost, then get bookkeeping help.
• You missed payroll deposits or returns, or the IRS has written to you about them: follow behind on payroll taxes, then get bookkeeping help.
• A non-US person owns the company: see bookkeeping for a foreign-owned US company and bookkeeping help.
• You sell on several platforms: see reconciling sales and payouts and ecommerce bookkeeper cost and scope.
• You collect sales tax in more than one state: see filing sales tax returns.
• Investors or a lender want monthly statements: see monthly financials for investors and the board.
• You want the year closed for the return: see the year-end close checklist.