A CEMA mortgage tax calculator in New York works off one subtraction: your new loan amount minus your existing unpaid principal balance equals the “gap mortgage,” and that gap is the only portion subject to recording tax. Multiply the gap by your location’s combined rate, then subtract the lender and processing fees both sides charge to do the deal. On a NYC refinance where you owe $400,000 and borrow $550,000, the taxable gap is $150,000 instead of the full $550,000, which at the 2.175% residential rate drops your recording tax from $11,962.50 to $3,262.50 before fees.
The Two Numbers You Need Before You Calculate
Pull your most recent mortgage statement for the current unpaid principal balance. Not the original loan amount, not the payoff quote with interest and fees baked in: the principal balance as of today. Then get the new loan amount from your lender’s loan estimate.
Those two figures drive everything. The difference between them is your gap mortgage, and under New York Tax Law § 255, a consolidated mortgage recorded to modify an existing loan is not taxed again on the original debt as long as the prior mortgage’s taxes were already paid.1New York State Senate. New York Code TAX 255 – Supplemental Mortgages Tax applies only to the new indebtedness beyond what the recorded mortgage already secured.
Pick the Right Recording Tax Rate
New York’s mortgage recording tax stacks four separate levies. The basic state tax under Tax Law § 253 is $0.50 per $100 of mortgage debt, the state adds a special additional tax of $0.25 per $100, and counties in the Metropolitan Commuter Transportation District (including all five NYC boroughs) carry an additional tax of $0.30 per $100.2New York State Department of Taxation and Finance. Mortgage Recording Tax
Tax Law § 253-a then adds the city’s own layer, which varies by loan size and property type. For mortgages under $500,000, the city tax is $1.00 per $100. For one-, two-, or three-family homes and individual condo units with mortgages of $500,000 or more, it rises to $1.125 per $100. For all other property, including larger residential buildings and commercial real estate, the city rate is $1.75 per $100.3New York State Senate. New York Code TAX 253-a – Recording Tax
Combined NYC rates work out to:
- Residential under $500,000: 2.05%
- Residential $500,000 and above (1-3 family or condo): 2.175%
- All other property (4+ unit buildings, commercial): 2.80%
One wrinkle changes what you actually pay. For residential properties with six or fewer dwelling units, the lender pays the 0.25% special additional tax, not the borrower.4New York State Senate. New York Code TAX 253 – Recording Tax Your effective out-of-pocket rate drops to 1.80% for loans under $500,000 and 1.925% for loans at or above that threshold. A calculator that ignores this split will overstate what you owe at closing.
Outside NYC, the state components are the same, except that counties outside the Metropolitan Commuter Transportation District use $0.25 per $100 for the additional tax. Counties then layer on their own tax of $0.25 to $0.50 per $100. Yonkers adds its own $0.50 per $100 city recording tax, which applies to mortgages recorded through August 2027.5eCode360. City of Yonkers Code 15-141 – Imposition of Tax The Westchester County Clerk calculates Yonkers residential mortgage tax at 1.8% of the mortgage amount, minus a $30 deduction for one- or two-family dwellings.6Westchester County Clerk. Record a Mortgage
One other adjustment matters statewide: on one- or two-family residences, the first $10,000 of mortgage debt is excluded when computing the additional tax component. The savings run around $25 to $30 on a typical loan, but an accurate calculator includes it.
Step by Step With a Worked Example
Take a NYC refinance where you owe $400,000 and are borrowing $550,000.
Step 1. Find the gap mortgage. $550,000 − $400,000 = $150,000. That is the only amount subject to recording tax under the CEMA.
Step 2. Determine your rate tier from the new total loan. The $550,000 total puts this mortgage in the 2.175% NYC residential tier. Under § 253-a’s aggregation rules, the total loan amount determines which tier applies, even though tax is only collected on the gap.3New York State Senate. New York Code TAX 253-a – Recording Tax
Step 3. Apply the rate to the gap. $150,000 × 2.175% = $3,262.50.
Step 4. Compare to a standard refinance. Without a CEMA, tax applies to the full new loan: $550,000 × 2.175% = $11,962.50.
Step 5. Gross savings. $11,962.50 − $3,262.50 = $8,700.
Because the lender covers 0.25% on residential loans, your actual out-of-pocket is $150,000 × 1.925% = $2,887.50 with the CEMA, versus $550,000 × 1.925% = $10,587.50 without it. The gross savings figure is the same either way.
Subtract the Fees to Get Net Savings
A CEMA involves two lenders’ legal teams, and both charge for the coordination. Expect processing fees of roughly $500 to $750 per lender plus around $500 in additional recording fees. Most borrowers end up in the $1,500 to $2,000 range for administrative costs. Bank attorneys reviewing the consolidation package and verifying the chain of mortgage assignments add to that total.
Subtract everything from the gross tax savings. In the running example, $8,700 minus roughly $2,000 in fees leaves a net benefit of about $6,700. That holds up on a $550,000 loan with a $150,000 gap. It falls apart quickly on smaller gaps: if you’re refinancing a balance close to what you already owe, the taxable gap is small, the tax savings are modest, and the fees can swallow most of the benefit.
As a rough benchmark, if the existing mortgage balance is below roughly $300,000 to $500,000, the administrative costs and delays can outweigh the tax savings, particularly outside NYC where the combined rate is lower. Someone refinancing a $200,000 balance in a county with a 1.05% combined rate (after the lender’s share) saves far less than someone doing the same in Manhattan at 1.925%.
Purchase CEMAs Use the Same Formula
In a purchase transaction, the buyer’s new lender takes an assignment of the seller’s existing mortgage instead of recording an entirely new lien. The buyer pays recording tax only on the gap between the new loan amount and the seller’s unpaid balance. If the seller owes $400,000 and the buyer borrows $600,000, the taxable gap is $200,000.7New York State Department of Financial Services. OGC Opinion No. 08-04-17 – Mortgage Tax Guarantee
The math is identical, but the mechanics are harder. Both lenders have to agree to the assignment, and the seller has little financial incentive to help since the tax savings go to the buyer. Some purchase contracts include a provision requiring the seller to make reasonable efforts to facilitate the process.
When the Calculator Doesn’t Apply
Co-op apartments don’t need a CEMA. Co-op shares are classified as personal property rather than real property under New York law, so no mortgage recording tax applies when financing a co-op purchase or refinance. The savings calculation is only relevant for condos, townhouses, single-family homes, and other real property.
Timeline can override the savings too. A standard refinance typically closes in about 30 days. A CEMA adds significant time because the existing lender must locate and deliver original notes, mortgage assignments, and related documents to the new lender, commonly taking 30 to 60 business days on its own. Total closing time for a CEMA refinance averages around 75 days. If a rate lock or contract deadline is driving you, the delay may cost more than the tax savings are worth.
And the option isn’t always on the table. If your current servicer can’t produce the original note or won’t cooperate, there is no mechanism to force a CEMA. Run the calculator to see what’s at stake, then confirm with your new lender that the existing servicer will participate before you count on the savings.