20 CFR § 404.435 - Excess earnings; months to which excess earnings can or cannot be charged; grace year defined.
(a) Monthly benefits payable. We will not reduce your benefits on account of excess earnings for any month in which you, the beneficiary—
(1) Were not entitled to a monthly benefit;
(2) Were considered not entitled to benefits (due to non-covered work outside the United States or no child in care, as described in § 404.436);
(3) Were at full retirement age (as described in § 404.409(a));
(4) Were entitled to payment of a disability insurance benefit as defined in § 404.315; (see §§ 404.1592 and 404.1592a(b) which describes the work test if you are entitled to disability benefits);
(5) Are age 18 or over and entitled to a child's insurance benefit based on disability;
(6) Are entitled to a widow's or widower's insurance benefit based on disability; or
(7) Had a non-service month in your grace year (see paragraph (b) of this section). A non-service month is any month in which you, while entitled to retirement or survivors benefits:
(i) Do not work in self-employment (see paragraphs (c) and (d) of this section);
(ii) Do not perform services for wages greater than the monthly exempt amount set for that month (see paragraph (e) of this section and § 404.430); and
(iii) Do not work in non-covered remunerative activity on 7 or more days in a month while outside the United States. A non-service month occurs even if there are no excess earnings in the year.
(b) Grace year defined.
(1) A beneficiary's initial grace year is the first taxable year in which the beneficiary has a non-service month (see paragraph (a)(7) of this section) in or after the month in which the beneficiary is entitled to a retirement, auxiliary, or survivor's benefit.
(2) A beneficiary may have another grace year each time his or her entitlement to one type of benefit ends and, after a break in entitlement of at least one month, the beneficiary becomes entitled to a different type of retirement or survivors benefit. The new grace year would then be the taxable year in which the first non-service month occurs after the break in entitlement.
(3) For purposes of determining whether a given year is a beneficiary's grace year, we will not count as a non-service month, a month that occurred while the beneficiary was entitled to disability benefits under section 223 of the Social Security Act or as a disabled widow, widower, or child under section 202.
(4) A beneficiary entitled to child's benefits, to spouse's benefits before age 62 (entitled only by reason of having a child in his or her care), or to mother's or father's benefits is entitled to a termination grace year in any year the beneficiary's entitlement to these types of benefits terminates. This provision does not apply if the termination is because of death or if the beneficiary is entitled to a Social Security benefit for the month following the month in which the entitlement ended. The beneficiary is entitled to a termination grace year in addition to any other grace year(s) available to him or her.
(c) You worked in self-employment. You are considered to have worked in self-employment in any month in which you performed substantial services (see § 404.446) in the operation of a trade or business (or in a combination of trades and businesses if there are more than one), as an owner or partner even though you had no earnings or net earnings resulting from your services during the month.
(d) Presumption regarding work in self-employment. You are presumed to have worked in self-employment in each month of your taxable year until you show to our satisfaction that in a particular month you did not perform substantial services (see § 404.446(c)) in any trades and businesses from which you derived your annual net income or loss (see § 404.429).
(e) Presumption regarding services for wages. You are presumed to have performed services in any month for wages (as defined in § 404.429) of more than the applicable monthly exempt amount in each month of the year, until you show to our satisfaction that you did not perform services for wages in that month that exceeded the monthly exempt amount.