The 2018 COLA increase was not retroactive — it started in January 2018 and you received it beginning with your January payment

Social Security does not pay COLA increases retroactively. When the 2018 cost-of-living adjustment took effect on January 1, 2018, your new benefit amount started with your January 2018 payment. There was no lump sum for the months before the increase went into effect, and no back pay for 2017.

This is how COLA works every year. The adjustment is calculated in October of the previous year, announced in early November, and then applied to your benefit starting January 1. Your payment in January reflects the new amount — not a catch-up payment, but your ongoing benefit at the new rate.

Key Takeaways

  • The 2018 COLA increase began with your January 2018 payment, not retroactively to an earlier month.
  • Social Security never pays COLA increases as lump-sum back pay for prior months.
  • Your January 2018 payment showed your new benefit amount, which then continued each month at that higher rate.
  • If you did not see an increase in January 2018, contact Social Security to confirm your account was updated correctly.

When the 2018 increase took effect

The 2018 COLA was 2 percent. Social Security announced this figure on November 2, 2017, and the increase became effective on January 1, 2018. Your first payment reflecting this increase arrived in January 2018 (or early February, depending on your payment date).

SSDI payments are issued once a month on a set schedule based on your birth date. If your payment date is the third Wednesday of the month, for example, your January 2018 payment arrived on the third Wednesday of January and included the 2 percent increase. That higher amount then continued for every month after.

Why COLA is not paid retroactively

Social Security treats COLA as a permanent adjustment to your ongoing benefit, not as a one-time correction for past underpayment. The law requires that COLA take effect on January 1 each year, but it does not require back pay for the months before that date.

This means if you received $1,000 per month in December 2017 and your 2018 COLA raised your benefit to $1,020 per month, you do not receive $20 for each of the months you were paid at the lower rate. Instead, your benefit is $1,020 starting in January 2018 and continues at that rate going forward.

What to do if your January 2018 payment did not increase

If you did not see an increase in your January 2018 SSDI payment, the first step is to check your Social Security account online at ssa.gov. Log in and look at your payment history to see what amount you received in December 2017 and January 2018. A clear record of both payments will help you understand whether the increase was applied.

If the January amount is the same as December, contact Social Security directly. Call 1-800-772-1213 (TTY 1-800-325-0778) and ask a representative to review your account. Errors in explore COLA are rare, but they do happen, and Social Security can correct them if one occurred on your account.

How COLA affects your future benefits

Once the 2018 COLA increase was applied to your benefit in January 2018, that higher amount became your new baseline. Every future COLA adjustment is calculated from that new amount, not from your pre-2018 benefit. This means the 2 percent increase compounded with any increases in later years.

For example, if your benefit was $1,000 in December 2017, the 2018 COLA made it $1,020. If the 2019 COLA was 1.6 percent, it was applied to the $1,020 amount, not the original $1,000. This is why COLA increases, though small each year, add up over time.

Frequently Asked Questions

Can I request back pay for the months before January 2018?

No. Social Security does not issue back pay for COLA increases. The increase is effective January 1, and your payment in January reflects the new amount. If you believe an error was made in calculating or explore your 2018 COLA, contact Social Security to have your account reviewed, but retroactive payment is not available.

What if I was not receiving SSDI in January 2018?

If you began receiving SSDI after January 2018, your benefit amount was calculated using the current benefit formula at the time you were approved. You would not receive the 2018 COLA retroactively. Your benefit would reflect the COLA adjustments that were in effect when your payments began.

Does the 2018 COLA affect my Medicare or Medicaid?

The COLA increase affects your SSDI payment amount. If you receive Medicare, your Part B premium may change based on your new income level, though most beneficiaries are protected from premium increases by a "hold harmless" rule. Medicaid is managed by your state, so contact your state Medicaid office to understand how a benefit increase affects your coverage.

How do I know what my 2018 COLA increase was?

The 2018 COLA was 2 percent across all Social Security and SSDI benefits. To see how much your specific benefit increased, compare your December 2017 payment to your January 2018 payment. The difference is your 2 percent increase. You can also view your payment history online at ssa.gov or call Social Security to ask.