Built around the classic 28/36 rule, with Illinois realities baked in: 2.0–2.4% property tax, PMI on conventional loans under 20% down, USDA/VA zero-down options across most of Central Illinois. Enter your income and the math updates instantly.
National mortgage calculators skip the things that matter most in Illinois. This one doesn't. Here's what's actually being calculated — and what most calculators get wrong.
The amortized loan portion. We use the standard formula: M = P × (r(1+r)n) / ((1+r)n − 1), where M is the monthly payment, P is the loan amount, r is the monthly interest rate (annual ÷ 12), and n is the total number of monthly payments (years × 12). This is the only part of your payment that's actually paying down the loan.
Illinois property taxes are higher than the national average. Effective rates across our Central Illinois service area run 2.0–2.4% of assessed value — roughly double the national 1.1% average. We default to 2.2% in the calculator, but specific counties vary: Morgan County runs ~2.2%, Sangamon County ~2.0%, Macoupin and the southern counties can hit 2.4%+. On a $200K home, that's $4,000–$4,800 per year — or $333–$400 every month escrowed into your payment.
Central Illinois insurance premiums are roughly average for the Midwest — $1,200–$1,800 per year typical for a $200K home with standard coverage. Higher for older housing stock with original electrical or knob-and-tube wiring (common in Jacksonville's Hill District or Springfield's Aristocracy Hill). Lower for newer construction in South Chatham and similar subdivisions.
On a conventional loan with less than 20% down, lenders require PMI — typically 0.4–1.0% of the loan amount annually. The calculator estimates 0.5% as a middle-of-road number. USDA and VA loans do NOT have PMI. FHA has a similar charge called MIP that works differently. See our guide to removing PMI and USDA/VA zero-down options.
Three numbers that most national calculators ignore.
Illinois has some of the highest effective property tax rates in the country — nearly double the national average. On a $200K home that's $4,000–$4,800 annually, or $333–$400/month escrowed. A national calculator using 1.1% will understate your real payment by ~$200/month.
Most of Apex's Central Illinois service area — Morgan, Cass, Scott, Pike, Greene, Brown, Schuyler and parts of Macoupin, Menard, and Sangamon counties — qualifies for USDA Rural Development zero-down financing. Income limits roughly $90K–$105K for typical household sizes. National calculators rarely surface this.
Illinois is an attorney-state. Buyer closing costs run 2–3% of purchase price and include items national calculators ignore: attorney fee ($400–$1,200), state + county + sometimes municipal transfer stamps, and an attorney-driven closing process that affects timeline. See our full closing cost breakdown.
Three real-world examples using the median price band in each market and current 2026 conventional rates (6.75% assumed). Tax rates use the county-effective average.
These are estimates — lender pricing, your specific credit score, escrow account requirements, HOA fees, and current rate environment all move the numbers. Use the calculator above with your specific numbers, then talk to a licensed lender for a real rate quote.
The classic rule of thumb for home affordability. The Affordability Calculator tab above uses this framework.
Your monthly housing payment (principal, interest, tax escrow, insurance, PMI) should be no more than 28% of your gross monthly income. On a $75,000 annual income ($6,250/mo gross), that's a maximum housing payment of $1,750.
Your total monthly debt payments — housing + car loans + student loans + credit card minimums — should be no more than 36% of gross income. Same $75K income = $2,250 max total debt service. Subtract existing debts to find your housing room.
Most Central Illinois lenders qualify borrowers up to 43–50% DTI with strong credit, reserves, and stable employment. USDA and VA loans often stretch further. The 28/36 rule is the conservative answer — what you'd be comfortable spending. Lenders will sign you off on a bigger number; that doesn't always mean you should take it. Read our full DTI guide.
Most Central Illinois buyers don't need 20% down. The four programs we see most.
Most Central IL counties qualify. Income limits ~$90–105K. No PMI. See USDA + VA guide.
Active duty + veterans. No income limit. No PMI. Funding fee 1.4–3.6% (waived for disabled vets).
Credit-flexible (580+). MIP applies for life of loan on most modern FHA loans — not the same as PMI on conventional.
Best for 680+ credit. PMI required under 20% down — can be removed when LTV hits 80%.
Don't forget about Illinois down payment assistance — IHDA Access can layer with most loan types and provides up to $6,000–$10,000 toward down payment + closing costs for qualifying buyers.
Apex Realty's two largest markets — Jacksonville in Morgan County and Springfield in Sangamon County — sit about 35 miles apart on I-72. The map below shows live MLS listings across both. Use the calculator above with any of these prices to model a real payment.
Posts from our Central Illinois real estate library.
Itemized: title insurance, attorney, transfer stamps, escrow prepays. Real numbers on $200K.
First-Time BuyersBust the 20% down myth. Real cash-to-close for every loan type.
ProgramsIHDA Access, USDA stacking, VA loans, municipal grants — the full IL picture.
Zero-Down FinancingWhy Central Illinois is one of the best zero-down geographies in the country.
Market TrendsHonest forecast. The math of waiting vs. buying now. Marry the house, date the rate.
FinancingSide-by-side math on a $200K Central IL home. Which actually wins.
FinancingThe current-appraisal route. Why rising Central IL values 2020–2026 let many homeowners drop PMI early.
Financing2-1, 3-2-1, permanent. Real math on a $200K loan. When buyers should ask.
FinancingThe number lenders care about most. Strategies to improve before applying.
Sister CalculatorHave a specific home price in mind? Flip the math — see the full monthly payment with IL tax, PMI, insurance.
Using the conservative 28% rule, your maximum monthly housing payment on a $75,000 gross income is roughly $1,750. With current 2026 rates (~6.75%), Illinois property taxes (~2.2%), and standard insurance, that supports a home in the $200K–$235K range with 5–10% down. Most Central Illinois lenders will approve you for more — the 28% rule is what's comfortable, not what's possible.
On a $200,000 home with 5% down ($10,000), a 30-year conventional loan at 6.75%, Illinois property taxes at 2.2%, and standard insurance, the full PITI payment runs approximately $1,800–$1,850 per month including PMI. Drop the rate to 6.25% (rate buydown) or use a USDA loan (no PMI) and you can shave $100–$200 off that number.
Illinois has some of the highest effective property tax rates in the country — typically 2.0–2.4% of assessed value versus the national average of 1.1%. On a $200K home that's $4,000–$4,800 per year, or $333–$400 per month escrowed into your mortgage payment. Specific rates vary by county and township. National mortgage calculators using a generic 1.1% rate will understate your real payment by $150–$200/month.
Yes — when your down payment is less than 20%, the calculator estimates PMI at approximately 0.5% of the loan amount annually (a middle-of-the-road estimate). Actual PMI varies from 0.4–1.0% depending on your credit score, loan-to-value ratio, and lender. USDA and VA loans do NOT have PMI; FHA has a similar but distinct charge called MIP.
The 28/36 rule is a conservative budgeting framework: housing payment under 28% of gross income, total debt under 36%. Lenders will usually approve borrowers up to 43–50% DTI on conventional and FHA loans, and USDA/VA can stretch further with strong credit and reserves. The lender's maximum is what's possible. The 28/36 rule is what's comfortable. For most first-time buyers, comfortable is the safer target.
Use this calculator to ballpark payments and explore scenarios. Then get a real pre-approval from a licensed lender before you start touring homes. A pre-approval pulls your actual credit, validates your income documentation, and gives you a binding letter that listing agents in Central Illinois will require to even consider your offer. Apex works with several local lenders — we'll connect you when you're ready.
As of mid-2026, 30-year conventional rates are running approximately 6.5–7.0% for buyers with strong credit. 15-year rates are typically 0.5–0.75% lower. USDA and VA rates are usually slightly below conventional. The default 6.75% in the calculator is a reasonable middle-of-the-pack number for a 700+ credit-score borrower. Your actual rate depends on credit, loan type, down payment, and lender. See our rate forecast for current context.
Yes — most of Apex's Central Illinois service area (Morgan, Cass, Scott, Pike, Greene, Brown, Schuyler, plus parts of Macoupin and Menard) is USDA Rural Development eligible. USDA loans require 0% down with no PMI, subject to income limits (~$90–105K household). VA loans are 0% down for active duty and veterans. Plus IHDA Access programs can layer $6,000–$10,000 in down payment + closing cost assistance on top. Read the USDA + VA guide.
This calculator gets you in the ballpark. A 15-minute call with an Apex agent gets you a real pre-approval, a real rate quote from our local lender network, and an honest read on what's actually possible in your market.
