Illinois SSDI payment amounts follow the federal formula, not a state-specific rate

Social Security Disability Insurance (SSDI) in Illinois uses the same payment calculation as every other state. The amount you receive depends on your Primary Insurance Amount (PIA), which is based on your earnings history, not on where you live or how much you need. Illinois does not add a state supplement to SSDI the way some states do for Supplemental Security Income (SSI).

Your payment is recalculated each year when Social Security applies the annual cost-of-living adjustment (COLA). In 2024, COLA was 3.2 percent. The adjustment applies to all beneficiaries on the same schedule, regardless of state.

If you also receive SSI in Illinois, that is a separate payment with its own rules and amounts. This guide focuses on SSDI only.

Key Takeaways

  • SSDI payments in Illinois are calculated from your work history earnings, not from a state rate or your living expenses.
  • The average SSDI payment nationally is around $1,550 per month, but your actual amount depends on how much you earned before you became unable to work.
  • Illinois does not supplement SSDI with additional state funds, though you may be able to receive both SSDI and SSI if your income is low enough.
  • Your payment increases each January when Social Security applies the annual cost-of-living adjustment to all beneficiaries.
  • You can see your estimated payment amount by creating a my Social Security account online before you file.

How Social Security calculates your SSDI amount

Social Security looks at your highest 35 years of earnings and calculates an average monthly income. That average is plugged into a formula with three "bend points" — thresholds where the replacement rate changes. The formula is the same for everyone, but the dollar amounts of the bend points change each year.

For 2024, the bend points are $1,174 and $7,078. If your average monthly earnings fall below $1,174, you receive 90 percent of that amount. Earnings between $1,174 and $7,078 are replaced at 32 percent. Earnings above $7,078 are replaced at 15 percent. The three pieces are added together to get your PIA.

The bend points shift upward each year based on national wage growth. This means someone filing in 2025 will have different bend points than someone who filed in 2024, even if their earnings history is identical.

What the average SSDI payment covers in Illinois

The national average SSDI payment is approximately $1,550 per month, though this varies widely. Some beneficiaries receive $600 per month; others receive over $3,500. Your actual amount depends entirely on your work history.

Illinois has no state income tax on SSDI, which means your full federal payment is not reduced by state withholding. However, SSDI is subject to federal income tax if your combined income (SSDI plus other income) exceeds certain thresholds. For 2024, if you file as single and your combined income exceeds $25,000, up to 85 percent of your SSDI may be taxable.

The cost of living in Illinois varies by region. Chicago has higher housing costs than rural areas, but SSDI payments do not adjust for local costs. Your payment is the same whether you live in Chicago, Springfield, or a small town.

How to estimate your SSDI payment before you file

You can create a free my Social Security account at ssa.gov and view your earnings record and estimated benefit amount. This estimate is based on your actual reported earnings and assumes you become unable to work at your current age. The estimate updates each time Social Security posts new earnings to your record.

The estimate assumes you wait until your full retirement age to claim. If you claim at a younger age, your payment will be permanently reduced. If you delay past your full retirement age, your payment will increase by about 8 percent per year until age 70.

The estimate is not a may provide. Social Security will recalculate your actual PIA when you file, and the result may differ slightly from the online estimate.

SSDI and SSI together in Illinois

If your SSDI payment is very low, you may also be able to receive Supplemental Security Income (SSI). SSI is a needs-based program with its own income and asset limits. In Illinois, the SSI federal payment standard for 2024 is $943 per month for an individual living independently.

If you receive both SSDI and SSI, your SSDI payment is counted as income against your SSI limit. Social Security will pay your full SSDI amount first, then add SSI to bring your total to the SSI standard (minus any other countable income). This is called "deemed" income.

Illinois does not add a state supplement to SSI, so you receive only the federal amount. Some other states provide additional SSI payments; Illinois does not.

Changes to your payment after you start receiving SSDI

Once you are on SSDI, your payment can change for a few reasons. The annual COLA adjustment happens in January and applies to all beneficiaries. If you return to work and earn above the substantial gainful activity (SGA) threshold — $1,550 per month in 2024 — your benefits may stop or be reduced, depending on how much you earn and for how long.

If you have a child under 19 (or 19 if still in high school), that child may receive a payment based on your record. The child's payment is typically 50 percent of your PIA, but the total family payment cannot exceed 150 to 180 percent of your PIA. If you have multiple family members on your record, each person's payment is reduced proportionally.

You should report any change in your living situation, income, or work status to Social Security. Changes can affect your payment or your continued may be able to access for SSDI.

Frequently Asked Questions

Can I find out my exact SSDI payment amount before I file?

You can see an estimate through your my Social Security account, but the exact amount is calculated when you file. The estimate is usually accurate within a few dollars, but Social Security may find unreported earnings or make other adjustments during the filing process.

Does Illinois add money to SSDI payments?

No. Illinois does not supplement SSDI. Your payment is the federal amount only. If you also receive SSI, Illinois does not add a state supplement to that either.

What happens to my SSDI if I move to another state?

Your SSDI payment does not change. The amount is based on your work history, not your location. You can move to any state and continue receiving the same payment.

Is my SSDI payment taxed in Illinois?

Illinois does not tax SSDI. However, the federal government may tax your SSDI if your combined income (SSDI plus wages, interest, and other income) exceeds $25,000 for a single filer. You should consult a tax professional about your specific situation.

How much will my payment increase when COLA is applied?

Your payment increases by the same percentage as the COLA adjustment. In 2024, that was 3.2 percent. The adjustment is applied in January and affects all beneficiaries on the same schedule. The 2025 COLA percentage will be announced in October 2024.