The day after March 31 or September 15
Real property tax in the District is billed in halves, due March 31 and September 15. The calculation article walks through the math on the bill itself. The morning after the due date, OTR adds a late payment penalty to the unpaid amount and begins charging interest on the balance, and the interest keeps running monthly until the account is clear. On a Class 3 half the base is already large, so the add ons are real money, and they accrue on the disputed amount just as they would on an ordinary bill.
The bill does not know the class is disputed. The appeal stepsexplain what happens to the bill while you wait, and the short version is that nothing pauses it. A pending response form, a status review hearing on the calendar, an appeal filed with RPTAC: none of these stop the penalty, the interest, or the tax sale. Owners who stop paying because they are "in the appeal" are the owners who later call us about a lien.
What an OTR payment agreement does and does not do
OTR will set up an installment agreement on a delinquent real property balance for an owner who asks, and MyTax is where the request starts. The agreement spreads the balance over monthly payments. It does not waive what has accrued, it does not reduce the rate, and interest generally continues on the unpaid portion while you pay it down. What it does is keep the account in a status OTR recognizes as being paid, which is the point.
Two cautions. First, an agreement on a Class 3 balance is an agreement to pay the Class 3 amount, and if the designation is later corrected the difference comes back as a credit or a refund through the process in the refund article. You are not conceding the class by paying it. Second, a missed installment ends the agreement, and the account goes back to plain delinquent with everything that follows.
The tax sale line
The District holds a tax sale each year, and the properties on the list are the ones with delinquent real property tax as of OTR's cutoff. What is sold is a lien for the unpaid amount plus costs, not the building. The tax sale articlecovers the purchaser's rights, the 6 month wait before a foreclosure case can start, and how redemption works. What matters for an owner deciding which bill to pay is that any real property tax still owing at the annual cutoff puts the account on the list, and the law applies whatever you pay to the oldest lien first, so clearing the current half while an older half sits there does not move you off it. The redemption amount includes the purchaser's costs on top of the tax, penalty and interest. Every dollar of delay after the sale costs more than the same dollar before it.
The correction is the only thing that shrinks the bill
Penalty and interest are a percentage of the base, and the base is the Class 3 amount. A payment agreement changes the timing. Only a corrected designation changes the number, and it changes it retroactively to the half year in which the correction applies. A corrected $12,500 half becomes about $2,125, and the penalty and interest that were charged on the larger amount are recomputed on the smaller one when OTR posts the credit. The timeline runs a few months from a filing to a posted correction, which is why the correction should start the week the bill arrives, not after the payment plan is set.
The refund window is 3 years from the date each payment was made, so a half paid in installments over a year has a window that runs from each installment. It is not a reason to wait. Evidence of occupancy or of an exemption gets harder to gather every month, as the denial article shows in the cases that go wrong.
Where the money can come from
Owners with a mortgage sometimes discover the servicer has already paid the Class 3 half from escrow and the shortage is coming back as a bigger monthly payment. The escrow article explains that the servicer will pay OTR whatever OTR bills, which at least keeps the property off the tax sale while you correct the class. Owners without escrow have three ordinary sources: a payment agreement with OTR, a tenant whose rent covers the installments and whose lease also ends the vacancy, or a sale. If the building is going to be sold anyway, the selling articlecovers how an unpaid half lands on the closing statement and why a correction started before listing protects the seller's side of the proration.
The order of moves
- Pay whatever you can toward the oldest unpaid half before the due date, even if it is not the full amount. A partial payment reduces the base that penalty and interest run on.
- Request an installment agreement on MyTax for the rest and keep every installment. Put the dates on a calendar with a reminder a week ahead.
- Start the correction the same week: the response form if you are inside the 15 days, the correction and refund route if you are not. Gather occupancy or exemption evidence for each half in dispute.
- Register the building with DOB if it is genuinely empty, so a registration fine does not arrive on top of the tax, and file for whichever exemption fits.
- Check the account before the tax sale cutoff each year and confirm the oldest half is paid or under an active agreement.
- When the correction posts, confirm OTR recomputed penalty and interest on the corrected amount, and claim the refund for anything left as a credit you do not want carried forward.
If you would rather hand off the correction side, send us the address. We read the DOB record and the OTR account at no charge, including the delinquency and any sold lien, and tell you which halves can be corrected. Correction work is a flat $1,500 per tax period corrected, paid up front, and refunded in full for any period OTR does not correct. The payment agreement itself is between you and OTR; we tell you what to ask for.