Escrow Reserve Calculator
Every month your servicer collects a slice of your property tax and insurance bills, holds it, and pays those bills when they come due. On top of that, federal law lets the servicer keep a small reserve, called a cushion, against surprise increases. This escrow reserve calculator computes your monthly escrow payment and the maximum cushion your servicer can legally hold under RESPA, so you can check their math instead of trusting it.
Quick Answer
With $4,800 of annual property tax and $1,800 of insurance, your servicer collects $550 a month in escrow and may hold a cushion of up to $1,100: one-sixth of the $6,600 yearly total, the two-month federal maximum. First-year escrow collected totals $7,700. Anything above $1,100 in reserve exceeds what RESPA allows.
- Two months is the federal ceiling. RESPA caps the cushion at one-sixth of annual disbursements; no loan document can authorize more.
- The cap is a ceiling, not a requirement. Servicers do not have to hold any cushion, and your state or loan may set a lower one.
- Surpluses come back to you. A surplus of $50 or more must be refunded within 30 days of the annual analysis.
- Shortages get spread out. A shortage of a month’s escrow or more must be repayable over at least 12 months, not demanded at once.
The two-month ceiling in federal law
The Real Estate Settlement Procedures Act, at 12 U.S.C. 2609, prohibits lenders from requiring advance deposits beyond one-sixth of the estimated annual escrow charges. One-sixth of a year is two months, and that is the maximum reserve. The CFPB implements it through Regulation X at 12 CFR 1024.17, which also dictates exactly how servicers perform the annual escrow analysis. Roughly a dozen states go further, some capping the cushion below two months and some requiring interest on escrow balances, so the federal number is the most your servicer can hold, not necessarily what yours does hold.
If your annual statement shows a reserve above the one-sixth line, you are entitled to the excess back. The CFPB’s escrow explainer covers the account basics, and our mortgage escrow calculator models the monthly payment side.
How servicers build the cushion
Servicers do not guess at the reserve; Regulation X prescribes an aggregate analysis, a month-by-month trial balance over the coming year:
The servicer estimates each tax and insurance bill and when it is due.
Starting from zero, it adds your monthly payments and subtracts each bill month by month.
The lowest trial balance is raised to zero by collecting more upfront.
Up to two months of escrow payments are added on top, the legal reserve.
The cushion exists so a tax increase or an early insurance bill does not overdraw the account mid-year. Everything escrowed counts toward the one-sixth base: property tax, homeowners insurance, flood insurance, and PMI collected through escrow. That is why adding PMI to the escrow account raises the dollar size of the permitted cushion even though the ratio never changes. To see PMI’s own math, try our mortgage PMI calculator.
Shortages, surpluses, and your rights
The annual escrow analysis sorts every account into three buckets. A surplus of $50 or more must be refunded within 30 days as long as you are current; smaller surpluses can be credited forward. A shortage under one month’s escrow payment can be collected within 30 days or spread over 12 months at your option. A shortage of one month or more cannot be demanded as a lump sum: the servicer must let you repay it over at least 12 months. Demands for immediate payment of large shortages are one of the most common servicing violations.
Your payment can still jump legitimately: when taxes or insurance rise, the analysis raises both the monthly collection and the cushion, which is why escrow-driven payment shocks usually trace to the underlying bills, not the math. Verify the projected tax figure against your county assessor’s actual bill first; wrong-parcel and inflated projections are the most common escrow errors. For the payment impact, our mortgage payment calculator shows the full PITI picture.
What escrow calculators get wrong
Most escrow calculators divide the annual bills by 12 and stop, which answers the easy half of the question and ignores the reserve entirely. The cushion is where the money arguments live: borrowers overpay it at closing without knowing the two-month cap, and servicers occasionally hold more than the law allows for years. This calculator computes the one-sixth maximum explicitly and flags anything above it, because the reserve is the part worth checking. Its honest limit: the real analysis depends on disbursement timing through the year, which varies by county and insurer, so treat this as the ceiling test and read your servicer’s annual statement for the month-by-month truth.
Frequently Asked Questions
A small reserve your mortgage servicer holds in the escrow account beyond the exact tax and insurance bills, to cover unexpected increases or timing gaps. Federal law caps it at two months of escrow payments.
At most one-sixth of the estimated annual escrow disbursements, which equals two months of payments. State law or your mortgage documents can set a lower cap, but nothing can authorize more than the federal maximum.
One-twelfth of the estimated annual disbursements (tax plus insurance plus anything else escrowed), plus an amount to build or maintain the cushion and to cover any shortage. On $6,600 of annual bills, the base payment is $550 a month.
After the annual analysis, a surplus of $50 or more must be refunded to you within 30 days if your loan is current. Smaller surpluses may be refunded or credited toward next year’s payments.
Not if it equals or exceeds one month’s escrow payment: RESPA requires the servicer to let you repay it over at least 12 months. Only smaller shortages may be collected within 30 days.
Almost always the escrow: property taxes or insurance rose, so the annual analysis increased your monthly collection. The principal and interest portion of a fixed-rate loan never changes.
Federal law does not require it, but roughly a dozen states do. Check your state’s rules: where required, the servicer must pay interest on the funds it holds for you.
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References
- Consumer Financial Protection Bureau. 12 CFR 1024.17, Escrow Accounts (Regulation X). Accessed October 18, 2026.
- Consumer Financial Protection Bureau. What is an escrow or impound account? Accessed October 18, 2026.
- Consumer Financial Protection Bureau. What is private mortgage insurance? Accessed October 18, 2026.
- Consumer Financial Protection Bureau. Buying a House: Mortgage Tools and Resources. Accessed October 18, 2026.
- Internal Revenue Service. Publication 936, Home Mortgage Interest Deduction. Accessed October 18, 2026.
- Freddie Mac. Primary Mortgage Market Survey (PMMS). Accessed October 18, 2026.
- Fannie Mae. Single-Family Servicing Guide. Accessed October 18, 2026.
- National Association of Realtors. Existing-Home Sales Housing Statistics. Accessed October 18, 2026.
- U.S. Census Bureau. American Community Survey (ACS). Accessed October 18, 2026.
- Board of Governors of the Federal Reserve System. Consumer Credit (G.19). Accessed October 18, 2026.