After you file

The IRS distinguishes between a single employer, and multiple employers.

@erdoc000 If you have multiple employers the excess Social Security will be entered on line 11 of your Schedule 3. and carried over to the 1040 line 31, and yes you can Efile.

"Employer's error - If any one employer withheld too much Social Security, Tier 1 RRTA tax, or Tier 2 RRTA tax, you can't claim the excess as a credit against your income tax. Your employer should adjust the excess for you. If the employer doesn't adjust the overcollection, you can use Form 843, Claim for Refund and Request for Abatement to claim a refund.

Two or more employers - If you had more than one employer during the taxable year and your total wages and compensation were over the wage base limit for the year, the total Social Security tax or Social Security equivalent Tier 1 RRTA tax withheld may have exceeded the maximum amount due for the tax year. If you had more than one railroad employer, and your total compensation was over the maximum amount of wages subject to Tier 2 RRTA, the total Tier 2 RRTA tax withheld may have exceeded the maximum due for the tax year.

• If you had more than one employer and too much Social Security tax or Tier 1 RRTA tax withheld, you may be able to claim the excess as a credit against your income tax on your income tax return. Refer to “Excess Social Security and Tier 1 RRTA Tax Withheld” in the Instructions for Form 1040 (and Form 1040-SR) for more information.
• You may be entitled to a refund if you paid excess Tier 1 RRTA tax over the Tier 1 RRTA compensation base or if you paid excess Social Security tax over the Social Security wage base. The RRTA compensation base and Social Security wage base limits are separate and stand alone.
• If you had more than one employer and too much Tier 2 RRTA tax withheld, you may request a refund of the excess Tier 2 RRTA tax using Form 843PDF. Attach copies of your Forms W-2, Wage and Tax Statement for the year to Form 843."

Topic No. 608 Excess Social Security