Get Ready for the June Estimated-Tax Date

The April filing deadline is behind you, but many business owners who make federal estimated tax payments have another payment date coming up in June. The exact date, and whether it applies to your situation, is a question for your CPA or licensed tax professional, or for the IRS’s own guidance on Form 1040-ES, the form individuals use to figure and pay estimated tax. This post will not state that date as a fact for your business.

Your business structure, other income, withholding, credits, and changes during the year all affect the calculation, so no two business owners send the same amount on the same schedule. May is a good time to make sure the bookkeeping information behind that calculation is current, whatever the date turns out to be.

This is a bookkeeping prep checklist. Your tax professional can give you advice for your specific situation and calculate what you owe; your job is to give them numbers that are complete enough to use.

Confirm the Deadline, Then Get the Numbers Ready

Ask your CPA or licensed tax professional to confirm the current estimated-tax deadline and whether it applies to your situation. The answer depends on your business structure, other income, withholding, and which return or entity the payment belongs to. A sole proprietor, an S corporation shareholder, and a C corporation do not necessarily handle estimated taxes the same way.

Once you know the date, the rest of this checklist is about making sure the bookkeeping behind that conversation is ready before you have it.

1. Close the Books Through April

By mid-May, you should be able to finish April rather than handing over a year-to-date report full of unreconciled activity.

For every business checking account, savings account, credit card, loan, and payment processor:

Make sure the transactions are in the accounting system.
Match transfers between your own accounts instead of recording them as income or expenses.
Investigate duplicates, missing deposits, and unfamiliar charges.
Reconcile the account to its April statement.

A downloaded bank feed is not the same thing as a finished set of books. Reconciliation is the check that your records agree with the institution’s statement. It gives the rest of the review a dependable starting point.

Keep the supporting documents connected to the entries as you go. The IRS recordkeeping guide says business books should show income and expenses and identifies invoices, receipts, bills, statements, and proof of payment as supporting records.

2. Make Sure All Income Channels Are Represented

Service businesses often receive money through more places than the main checking account. You may have ACH deposits, checks, card payments, peer-to-peer payments, retainers, or payments collected through an invoicing platform.

Review each channel and ask:

Did every completed payout reach the books?
Were processing fees recorded separately from the gross payment when appropriate?
Did a transfer between accounts get mistaken for new revenue?
Are customer deposits or retainers being treated consistently?
Is any May work already billed but still unpaid?

Do not use the forms you may receive next January as your running income record. The IRS says books should show gross income, and its small-business recordkeeping guidance lists invoices and deposit information among the documents that support gross receipts.

If a deposit is unclear, flag it. One labeled question is much more useful than a confident guess that inflates revenue.

3. Review Expenses for Missing Context

An expense total does not tell the whole story if important transactions are sitting in “uncategorized,” “ask my accountant,” or a catch-all miscellaneous account.

Scan the year-to-date detail for:

Large or unusual purchases
New software, insurance, or professional-service costs
Equipment and other assets
Personal charges that accidentally used the business card
Business purchases paid from a personal account
Loan payments, owner contributions, and owner withdrawals
Contractor and payroll costs

Attach the receipt or invoice and add a brief business-purpose note when the merchant name does not explain the purchase. According to the IRS recordkeeping guide, supporting documents for expenses should identify the payee, amount, proof of payment, date, and the item or service involved.

Do not make a tax classification just to clear the review queue. Equipment, owner activity, loan payments, and mixed business-personal costs can require treatment that depends on the facts and the entity. Give your bookkeeper or tax professional the documentation and let the open question stay visible until it is answered.

4. Compare This Year With the Estimate You Started With

Many estimated-payment calculations begin with prior-year information or an earlier projection. By May, the business may be operating differently than anyone expected in January.

Compare actual year-to-date results with your plan and note changes such as:

A major new client or a client that left
A price increase
A slower-than-expected start to the year
A new employee or a larger contractor budget
A major equipment purchase
A change in the owner’s wages or outside income
A one-time project that will not repeat

You are not trying to recalculate the tax yourself. You are identifying what changed so the person doing the calculation does not have to discover it by accident.

This is especially important in a seasonal service business. A strong April and May may be the start of a busy season, not a monthly result that should be multiplied by twelve. Give your tax professional the context behind the numbers, including signed work expected later in the year and known costs required to deliver it.

5. Send a Small, Usable Review Package

More files do not automatically create more clarity. A useful package for discussion usually starts with:

A year-to-date profit and loss statement through April
A balance sheet as of April 30
A list of unreconciled accounts or unresolved transactions
The prior estimated-tax calculation or payment schedule, if you have one
Confirmation of payments already made for 2026
Notes about major changes expected during the rest of the year
Relevant payroll or withholding information requested by your tax professional

Ask what else is needed for your entity and personal return. Then send the reports early enough to leave time for questions.

If you make a payment, keep the confirmation with your tax records. Individual taxpayers can view payment history, including estimated payments, through an IRS Online Account. Record the payment in your books only after confirming the correct bookkeeping treatment for your entity; an owner’s individual estimated-tax payment is not automatically an ordinary business expense.

A useful habit: After this payment is handled, ask your CPA when the next estimated-tax date falls and schedule a bookkeeping review a few weeks before it. The books stay easier to hand off when they stay current between payments rather than getting rebuilt each time.

Clean Numbers Lead to a Better Conversation

Estimated taxes involve assumptions because the year is not finished. Clean bookkeeping cannot remove that uncertainty, but it can separate a reasonable estimate from a guess.

Reconcile the accounts. Check every income channel. Add context to unusual expenses. Write down what changed. Then let your tax professional apply the rules to a set of numbers you can support.

Bat City Books helps service-based small businesses keep their books current and their financial information ready for the next decision. If every tax deadline turns into a bookkeeping scramble, let’s talk.