Hong Life CalculatorsUnderstanding the PITI and escrow calculator — concept and principle
PITI stands for principal, interest, taxes and insurance, the four parts of a typical US monthly mortgage payment. Many lenders collect property tax and homeowners insurance each month into an escrow account and pay those bills on your behalf. This calculator adds up the full monthly housing payment, shows the escrow portion and breaks the total into its parts, including mortgage insurance and HOA dues.
How it is calculated
- Principal and interest: A = P × i ÷ (1 − (1 + i)^−N), with i = annual rate ÷ 12 and N = years × 12.
- Monthly escrow = property tax per year ÷ 12 + home insurance per year ÷ 12 + PMI per month.
- Total monthly housing payment = A + escrow + HOA per month.
HOA dues are usually paid directly to the association, not through escrow, but they are part of your housing cost.
The principle
Principal and interest stay fixed on a fixed-rate loan because the payment is set so the loan reaches zero exactly at the end of the term. Taxes and insurance are annual bills; spreading them over twelve months avoids a large lump sum and protects the lender, whose collateral depends on taxes being paid and the home being insured. Because tax assessments and premiums change, the servicer reviews the escrow account, typically once a year, and adjusts the monthly deposit.
Worked example
Default inputs: loan $320,000, 6%, 30 years, property tax $4,800 a year, insurance $1,800 a year, no PMI or HOA.
- Principal and interest: $1,918.56 per month.
- Property tax: 4,800 ÷ 12 = $400.00; insurance: 1,800 ÷ 12 = $150.00.
- Escrow: 400 + 150 + 0 = $550.00 per month.
- Total: 1,918.56 + 550 + 0 = $2,468.56.
Shares of the total: principal and interest 78%, tax 16%, insurance 6.1%.
How to read the result
The total, not just principal and interest, is what you should budget. Lenders compare it with gross monthly income when judging affordability, and a common rule of thumb keeps housing costs near 28% of gross income, though actual limits depend on the loan program. In high-tax areas the escrow share can be large, so the same loan can cost very different amounts in different places.
Common mistakes
- Comparing homes by loan payment alone and ignoring tax and insurance differences.
- Using the seller's current tax bill when a sale will trigger reassessment.
- Forgetting PMI on loans with less than 20% down.
- Leaving out HOA dues because they are not in escrow.
Frequently asked questions
What is escrow?
An account your loan servicer uses to collect and pay property tax and insurance.
Why did my mortgage payment go up?
Usually because property tax or insurance rose and the annual escrow review raised the monthly deposit.
Can I skip escrow?
Some lenders allow it with enough equity, sometimes for a fee; some loan types require it.
Sources: Consumer Financial Protection Bureau, "What is an escrow or impound account?" · Regulation X (RESPA), 12 CFR 1024.17, escrow accounts