MARINE CORPS BASIC PAY COMPARISON

by Semper Admin - Dual-PEBD Month-by-Month Pay Difference

Companion to the Semper Admin PEBD Calculator

Back to PEBD Calculator

OFFICIAL USE NOTICE

This tool produces estimates for administrative review. Official pay determinations require validation through DFAS and proper Marine Corps channels. Do not input classified or sensitive personal information.

Method. Synthetic 30-day months for all proration, February included. Day 31 never generates pay. YOS increases on the PEBD anniversary. Any change in either scenario splits both, so day counts match on every row.

HOW TO USE THIS TOOL
  1. Enter the two PEBDs. Scenario A is the original PEBD past pay was computed under. Scenario B is the corrected PEBD - arriving from the PEBD Calculator link fills both automatically.
  2. Set the calculation period. Pay is computed from the exact start date through the exact end date, month by month on the synthetic 30-day calendar.
  3. Build the career timeline. One row per rank held, chronological, inclusive dates, using exact pay-table rank codes (E1-E9, W1-W5, O1-O10, O1E-O3E, E0 for the sub-4-month entry rate). Leave the final end date empty for a still-current rank. The timeline must cover the whole period.
  4. Click Calculate Comparison. Every row shows the month, days paid, rank, both YOS values, both monthly rates, both prorated amounts, and the difference. A YOS anniversary or rate change mid-month splits the row.
  5. Read the totals. A negative difference means Scenario B pays less - the Marine was overpaid under the original PEBD. A positive difference means underpayment to be recovered.
  6. Export. Use Export CSV for the full row-by-row table, or Run Verification Case to confirm the engine against the reviewed Novak fixture before relying on a build. Export DTMS produces upload-ready TTC 693 (checkage) and 694 (credit) sheets with tax codes set per DODFMR Vol 7A: credits are tax code 3, and the 694 workbook carries a READ ME sheet reminding the clerk to change combat-zone months to 9 before upload. Checkages are tax code 3 in the current calendar year and tax code 4 for prior years. Because the codes are set from today's date, re-export any file you hold across 31 December.
Verify before official use. Estimates only. Official pay determinations come from DFAS through the chain of command.
GUIDED EXAMPLES - LOAD ONE, THEN CLICK CALCULATE COMPARISON

Each example fills the form. Review the inputs, click Calculate Comparison, and compare the totals against the expected values on the card.

1. One-Year PEBD Shift, Single Rank

An E5 whose PEBD moves one year later. Watch June 2024 - Scenario A crosses into the over-4 YOS band three months before Scenario B... the anniversary rows split mid-month.

Expected: A $40,388.40, B $40,039.95, Difference ($348.45)

2. Promotion Mid-Period

E6 promoted to E7 on 1 Sep 2024 across a two-year window. Rank changes split both scenarios identically - only the YOS bands differ.

Expected: A $115,048.66, B $113,974.79, Difference ($1,073.87)

3. Entry Rate - E0 Four-Month Rule

A new Marine at the E0 sub-4-month entry rate. Scenario B's earlier PEBD reaches the 4-month mark sooner, so B pays the full E1 rate earlier - a positive difference.

Expected: A $16,917.60, B $17,919.30, Difference $1,001.70

4. February 29 PEBD

An E4 with a leap-day PEBD. In non-leap years the anniversary falls back to Feb 28, in 2024 it lands on Feb 29 - both split February while it still totals 30 synthetic days.

Expected: A $69,528.11, B $67,761.60, Difference ($1,766.51)

5. Tax Codes - TTC 693 Checkage Across the Year Boundary

An E6 whose corrected PEBD moves 12 months later, so Scenario B pays less and every month is a checkage. The window runs 1 July of last year through 30 June of this year, and both scenarios hold a constant YOS band throughout, so no month nets to zero. Load it, click Calculate Comparison, then Export DTMS and open the 693 file. The TAX CODE column changes at the 1 January row and nowhere else. Prior-year checkages carry 4 because those years' taxes are already accounted for. Current-year checkages carry 3.

Expected: 12 rows on the 693 sheet. 6 dated last year at tax code 4, 6 dated this year at tax code 3. No 694 file.

6. Tax Codes - TTC 694 Credit and the Combat Zone Case

The same Marine and the same window with the two PEBDs swapped, so Scenario B pays more and every month is a credit. Export DTMS and open the 694 file. Every row carries tax code 3 regardless of year, because a retroactive credit is taxed under the code of the effective period rather than the year of payment. The workbook's READ ME sheet is the reminder: for any month the member was in a combat zone, change that row from 3 to 9 before upload. The tool does not know deployment dates.

Expected: 12 rows on the 694 sheet, every one at tax code 3, plus a READ ME sheet. No 693 file.

MEMBER INFORMATION

Used in export file names and inside the DTMS file. Processed on your device only.
The PEBD past pay was computed under
The corrected PEBD from the PEBD Calculator
Pay starts on this exact date, not the first of the month

CAREER TIMELINE

One row per rank held, chronological, inclusive dates. Use the exact pay-table rank code, O1E and O2E and O3E included where they apply. The timeline must cover the full calculation period.

Row Rank Code Start Date End Date Actions
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Disclaimer: This calculator is provided "AS-IS" for reference only. Always verify results against official military records.

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