Key takeaways
- The 2026 individual return is due April 15, 2027, and Form 4868 moves the filing date to October 15, 2027.
- The extension covers filing only. Tax owed is still due April 15, 2027.
- Whether a return is required is decided on total gross income, including gross rents, not on rental profit.
- The January 15, 2027 estimated payment is not needed if the 2026 return is filed and paid by January 31, 2027.
Know which return and which date apply
Individual landlords report rental income and expenses on Schedule E (Form 1040), Supplemental Income and Loss, so the rental follows the individual return date. The IRS says the individual return for a calendar-year filer is due April 15, and when day 15 falls on a Saturday, Sunday or legal holiday, the due date moves to the next business day. For tax year 2026 the return is due April 15, 2027. That date is a Thursday, so no weekend shift applies.
Check how the property is held before you set the calendar. A rental held in the owner's own name, or in a single-member LLC that is treated as a disregarded entity, is reported on the owner's Form 1040. A rental held through a partnership, including a multi-member LLC, is reported on Form 1065, an information return that has its own due date and extension rules. Do not give that client the April 15 date. Pull the due date from the Form 1065 instructions for the year first.
Decision rule: if the property sits in a partnership return, put the Form 1065 date on the calendar and treat the individual dates in this guide as the owner's personal deadlines only.
Filing thresholds: gross income, not rental profit
Whether a federal return is required turns on total gross income for the year, measured against the threshold for the filing status. The IRS defines gross income as all income you receive in the form of money, goods, property and services that is not exempt from tax. Gross rents count in full. The test starts from gross income, so rental expenses, repairs and depreciation are not subtracted to reach the threshold.
The threshold changes by tax year. Use the gross income table in Publication 501 for the year of the return you are preparing, and do not carry a prior-year figure into a 2026 return.
A net rental loss does not remove the return. The IRS says all rental income must be reported on your tax return, and deductible rental expenses can be more than gross rental income, subject to the passive activity limits described in Publication 925.
Decision rule: if the client had any tax withheld from wages or other income, file the return even when gross income is under the threshold. The refund depends on filing.
The extension moves the filing date, not the payment date
Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return, must be filed by the original due date, which is April 15, 2027 for tax year 2026. It gives until October 15, 2027 to file the return. The IRS says the extension is only for filing your return, so the balance is still due April 15, 2027.
Estimate the total 2026 tax, subtract withholding and credits, and pay the balance with the extension. The failure-to-pay penalty is 0.5% for each month of unpaid tax, so an estimate that is too low costs money even with a valid extension.
Send the client this wording in writing: "We will file a Form 4868 for you if the 2026 return cannot be finished by April 15, 2027. That form extends the time to file only. Please send an estimate of any balance due so we can pay it by April 15, 2027." The written warning is part of the file.
Failure mode: the extension is filed on time, but the payment is short. The client treats Form 4868 as a payment extension, and the failure-to-pay penalty starts on the unpaid balance from April 15, 2027. Fix it at the extension step by writing the estimated balance on the file before the form is sent.
Estimated tax when rental income makes it required
Rent is income with no withholding, and the IRS says estimated tax is the method used to pay tax on income that is not subject to withholding. Form 1040-ES is the form used to figure and pay it. A landlord whose wages already cover the tax may never need to make an estimated payment, so run the test before assuming it applies.
The general rule for 2026: you must pay estimated tax if you expect to owe at least $1,000 for 2026 after subtracting withholding and refundable credits, and your withholding and credits will be less than the smaller of 90% of the tax shown on your 2026 return or 100% of the tax shown on your 2025 return. The IRS says taxpayers should generally make the payments in four equal amounts to avoid a penalty.
Higher income changes one number. If your AGI for 2025 was more than $150,000 ($75,000 if your filing status for 2026 is married filing separately), substitute 110% for 100%. For 2025, AGI is the amount shown on Form 1040 or 1040-SR, line 11b.
Worked example. A single landlord whose 2025 AGI was under $150,000 owed $1,000 of tax for 2025. She expects $3,000 of tax for 2026 and has no withholding. She owes more than $1,000 after withholding, and her withholding is below both 90% of the 2026 tax and 100% of the 2025 tax, so the rule applies. The required annual payment is the smaller of those two amounts, which is the 2025 tax of $1,000. She pays four equal installments of one quarter of that amount on the 2026 dates above.
The 2026 installment calendar and the January 31 rule
The 2026 installment dates are April 15, 2026, June 15, 2026, September 15, 2026 and January 15, 2027. As of November 2026 the first three have passed, so the only installment still ahead for tax year 2026 is January 15, 2027. Ask for the payment history before the file is closed, because the penalty is figured separately for each payment period, using the instructions for Form 2210.
The January rule: if you file your 2026 Form 1040 by January 31, 2027, and pay the rest of the tax you owe, you do not need to make the January 15, 2027 payment. The rule removes the last installment only. A missed April, June or September installment still carries its own penalty.
Worked example for the same landlord. If she paid nothing toward the 2026 installments before November 2026, filing and paying by January 31, 2027 removes the January 15 payment only. The April, June and September periods still carry their own penalty, computed on Form 2210.
Penalties and 2025 returns that are still open
The failure-to-file penalty is 5% of the tax due for each month or part of a month the return is late, up to a maximum of 25%. The failure-to-pay penalty is 0.5% for each month. When both apply, the failure-to-file penalty is reduced by the failure-to-pay amount, and it stops growing after five months while the failure-to-pay penalty keeps running.
Tax year 2025 extended returns are now past the extended date. The October 15, 2026 deadline for a 2025 return filed on Form 4868 has passed, since today is in November 2026. Any 2025 rental return still unfiled needs a penalty estimate and a filing date in the file. Record the date Form 4868 was filed, the amount paid by April 15, 2026, and the balance still due.