Net vs Gross Annuity for Former Spouse: How Your COAP Share Is Calculated
The difference between gross and net annuity in a federal pension division can swing your monthly payment by hundreds of dollars. If your COAP awards you "50% of the annuity" without specifying which version, you need to understand exactly what OPM will calculate — because OPM follows the literal language of the court order, not what you and your attorney intended.
Gross Annuity vs. Net Annuity: What OPM Pays From
Gross annuity is the monthly annuity after any reduction to provide survivor annuity benefits, but before other deductions. The self-only annuity is the amount before a survivor benefit reduction.
Net annuity is the gross annuity after eligible deductions, including:
- Amounts owed by the retiree to the United States
- Health insurance premiums (FEHB or PSHB)
- Life insurance premiums (FEGLI)
- Medicare premiums
- Properly withheld federal income tax
- Properly withheld state income tax
If your COAP says "50% of the gross annuity," you receive half the full amount before those deductions come off. If it says "50% of the net annuity," you receive half of whatever is left after deductions — which can be substantially less.
How the Numbers Play Out
Consider a retiree with a gross FERS annuity of $4,200 per month after any survivor annuity reduction. If FEHB premiums are $340 and FEGLI premiums are $65 (ignoring taxes and other eligible deductions), the net is $3,795.
- 50% of gross: $2,100 per month
- 50% of net: about $1,898 per month
That's about a $203 monthly difference — roughly $2,430 per year — from three words in the court order.
What OPM Does When the Order Is Ambiguous
Under 5 CFR §§ 838.306(b) and 838.625(c), if a court order awards a percentage, fraction, or formula without specifying net or self-only annuity, OPM applies it to the gross annuity. This default favors the former spouse, but the order may direct otherwise.
OPM treats "disposable annuity" and "retirement check" as synonymous with net annuity, while "annuity without survivor benefit" is synonymous with self-only annuity. The order should specify "gross," "net," or "self-only" for a formula, percentage, or fraction.
The safest approach: a properly drafted COAP explicitly states "gross basic employee annuity" or "self-only annuity" (the annuity computed without the survivor benefit reduction). Ambiguity invites OPM to apply its regulatory default, which may not match what you negotiated.
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The Survivor Annuity Deduction Wrinkle
If your court order awards both an annuity share and a former-spouse survivor annuity, the survivor benefit reduction is included in the gross annuity calculation before OPM computes a share of gross or net. OPM does not invoice the former spouse separately for that cost. If the order assigns the cost to the former spouse, it must specify a formula that accounts for the survivor benefit reduction.
The Marital Fraction Adds Another Layer
Most COAPs don't award a flat percentage of the total annuity. They use a marital fraction: the numerator is the months of creditable federal service during the marriage, and the denominator is the total months of creditable service at retirement. Your share is that fraction multiplied by the percentage the court awarded.
For example: 20 years of service, 12 years during the marriage, court awards 50%:
- Marital fraction: 144 ÷ 240 = 0.60
- Former spouse share: 50% × 0.60 = 30% of the annuity base
Whether that 30% applies to gross or net determines your actual monthly payment.
Verifying the Calculation
After OPM finalizes the retirement claim and calculates your apportionment, they send you a computation letter showing the formula applied, the annuity base used, and your resulting monthly payment. Review this letter against your COAP language immediately.
If the computation doesn't match what your court order specifies, contact COBB at 1-888-767-6738 promptly and request a recalculation. You can also submit a written objection referencing the specific COAP provisions that OPM misapplied.
The Former Spouse Federal Benefits Guide includes a worksheet for projecting your annuity share under both gross and net scenarios, so you can estimate your monthly payment before the retiree even files for retirement.
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