Key takeaways
- Count returns, not entities: each federal return, state return, payroll quarter and sales tax period is billable work.
- For payments made in 2026, the Form 1099-NEC threshold is $2,000 per payee, so the vendor list is the first document to fix.
- Under the current instructions, a late Form 1065 or Form 1120-S carries a $255 penalty per partner or shareholder per month, so the filing date matters as much as the fee.
Count the returns behind the entity
The entity type sets the form, but the return count sets the bill. An S corporation with one shareholder, one state and no payroll is one federal return. Add a second shareholder, a state that needs its own entity return and monthly payroll, and the same business becomes several filings with separate reviews. Give the preparer the count before asking for a quote.
Count these items for each entity: the federal entity return (Form 1065, Form 1120-S or Form 1120), each state return the entity must file, each quarterly payroll return on Form 941, each sales tax period in each state, and each owner's individual return that picks up the K-1s. Ask whether owner returns are inside the quote.
Decision rule: if the entity has more than one owner, ask for a separate line for K-1 preparation. Each partner or shareholder receives a K-1 that must agree with the entity return, so the owner count drives both the entity work and the individual work.
Due dates for tax year 2026 that set the workload
Returns for tax year 2026 are filed in 2027. For calendar-year partnerships, Form 1065 is due March 15, 2027. The Form 1120-S due date for a calendar-year S corporation is also March 15, and March 15, 2027 is a Monday, so no weekend shift applies. The 2025 Form 1120-S moved to March 16, 2026 because March 15, 2026 fell on a Sunday.
Form 1120, the C corporation return, is due on the 15th day of the fourth month after the end of the tax year, which is April 15, 2027 for a calendar-year corporation. The owner's Form 1040 is also due April 15, 2027. An individual gets an automatic six-month extension by filing Form 4868 no later than the due date. An entity extends by filing Form 7004 by the regular due date of the return.
Publication 509 says that a due date falling on a Saturday, Sunday or legal holiday moves to the next day that is not one of those days. The Form 1099-NEC deadline for payments made in 2026 is January 31, 2027, a Sunday, so that filing moves to Monday, February 1, 2027.
The add-ons that raise the price
Payroll is the largest add-on for most small businesses. Each quarter adds a Form 941, the Employer's Quarterly Federal Tax Return, which reports the federal income tax withheld and the employer and employee shares of Social Security and Medicare tax. The 941 totals must tie to the payroll register and to the annual figures on the entity return. Ask whether the quote includes reconciling each 941 to payroll, or only the annual totals.
Multi-state work is the second add-on. A state where the entity has income, property or employees can require its own return, and each one adds a state form, apportionment work and a state extension decision. A federal-only quote leaves that work out.
Sales tax sits outside the federal entity return. It is billed per state and per filing period, and each state has its own deadline. If the client collects sales tax in more than one state, ask for one quote per state and per filing frequency.
Owner basis tracking adds hours to the entity return. Partners and S corporation shareholders need their basis rolled forward every year, and the work grows with each owner loan and each distribution.
Documents that cut preparer hours
The largest reduction in hours comes from a closed general ledger. Ask for a trial balance dated December 31, 2026, the general ledger export for the year, and the bank and credit card statements that tie to it. A preparer who receives a trial balance starts from the numbers. A raw bank download starts with categorizing, which is the most expensive place to start.
The vendor list cuts the 1099 work. For payments made in 2026, a Form 1099-NEC is generally required for each payee paid $2,000 or more for services. Send the list with the W-9 on file for each payee, and flag any payee paid by card or payment app, because those payments are generally reported by the payment company.
Payroll documents should come as a set: the quarterly summary from the payroll provider for each quarter, the year-end payroll register, and a split of officer wages from owner distributions. An S corporation preparer needs that split on every return, and a missing split delays the return.
The prior-year return with every schedule and K-1 is the cheapest source of opening balances. Include the prior-year basis schedule and the depreciation schedule in the same package.
How to get a quote that matches the work
Ask for a line-item quote that lists each federal return, state return, payroll quarter, sales tax filing, owner return and extension filing on a separate line. Say it in these words: “Please quote each federal return, each state return, each quarter of payroll and each sales tax filing as a separate line, and tell me which owner returns are included.” The preparer should answer each line by name.
Ask what triggers an add-on. The useful question is: “What is billed outside this quote, and at what hourly rate?” A quote that says additional work is billed at standard rates, with no rate given, is not a quote the client can compare.
Set the change rule in writing before the work starts. Use this sentence: “If the books are not closed by [date], the work moves to hourly billing, and I will confirm the revised estimate before you start.” The date should be the day the preparer needs the trial balance, not the day the return is due.
Failure modes and how to fix them
A late filing costs more than the fee difference. Under the current Form 1065 instructions, the penalty is $255 for each month or part of a month, up to 12 months, for each partner. Form 1120-S uses $255 per shareholder on the same basis. A three-partner partnership that files two months late faces three times two times $255 before any state penalty. Confirm the amount in the instructions for the return year, since it can change. The fix is to put the document deadline in the engagement letter, ahead of the extension date.
Owner basis is missing. Without the prior-year basis schedule, the preparer rebuilds it, and every year of rebuild is billed as hours. Request the basis schedule in the November package, not in March.
Vendor W-9s are missing in January. A Form 1099-NEC filed with a missing or wrong taxpayer ID creates a correction, and the correction returns in February as new hours. Collect each W-9 before the first payment to that vendor.
The payroll totals do not tie. A Form 941 total that differs from the payroll register sends the preparer into a trace that can run through several quarters. Reconcile each quarter in the month its 941 is filed, not in December.
The e-file signature arrives late. The e-file signature arrives late. Form 8879 authorizes e-filing of an individual return, and the entity equivalents are Form 8879-PE (partnerships), Form 8879-S (S corporations) and Form 8879-C (C corporations). The return cannot be transmitted until the right form is signed. Send the signature form with the draft return, not after the final review.
Build your own estimate
Use this formula: estimated fee equals the preparer's hours for each line on the list, multiplied by the firm's hourly rate, plus any add-ons the firm bills separately. Each federal return, state return, payroll quarter, sales tax filing and owner return takes its own block of hours, and the preparer's estimate for each block is the only reliable input.
Worked example in symbols: a firm charges R dollars per hour. The client has an S corporation with two shareholders, one state return, and four quarters of Form 941 reconciliation. Count the lines: one federal return, one state return, two owner returns and four payroll quarters. Multiply the expected hours for each line by R, then add any sales tax filings. Compare the total with the fixed quote, and ask the firm to explain any difference line by line.