Sold rental property on May 6. Do I have to pay estimated taxes all at once or do I pay in quarterly installments

[rjs]

To avoid a penalty you have to pay the full amount in one payment for the period in which the sale took place. For a sale in April or May of 2025 you have to make the estimated tax payment by June 16, 2025. (The due date is normally June 15. You get an extra day this year because June 15 is a Sunday.)