What the December 31, 2026 TDR deadline actually means

01

Four dates are being collapsed into one. They do different jobs.

MAS Solicitation Refresh 31 made TDR mandatory for every MAS SIN on April 2, 2026. GSA’s current instructions then describe a sequence: accept the required system-generated mass modification no later than 60 days after GSA issues it, complete the “Participate in TDR” modification and begin TDR on the first day of the following quarter.

That sequence creates several dates. Only one of them tells you when a monthly report is due.

Do not infer your effective date from a generic calendar. Read the awarded “Participate in TDR” modification and the date shown for your contract in SRP. GSA says pending A909 modifications may be corrected and contractors who already accepted A909 may receive a unilateral modification clarifying a July 1, 2026 effective date. If the date looks wrong, GSA directs contractors to their contracting officer.

02

The grace period and trial period are not the same protection.

Both run from July 1 through December 31, 2026, but they apply to different populations.

During either window, GSA says it will not take enforcement action for good-faith errors in the formatting or population of applicable data fields. That wording matters. The relief is about an honest field error while reporting—not a waiver of the report itself.

The dates are calendar-fixed. They do not promise each contractor six months after its own effective date. A contract that enters TDR later in the year has less of the published 2026 window remaining.

03

The trial period covers six fields, not the whole submission.

GSA’s MAS-TDR User Guide identifies the following fields. “Applies to” matters: a product date is not automatically required for a labor-category line, and a cloud classification is not required outside its SIN.

GSA also names order type, worksite and order discount as upcoming fields. Its guide says that guidance is not final until those fields are implemented and that a separate six-month trial will begin on implementation. Use the latest SRP template each month; do not build a required field from a draft description before it appears.

04

Five obligations continue during the transition window.

1. File every month. Report the month’s MAS sales within 30 calendar days after month-end. Confirm zero sales when there was no reportable activity.
2. Populate required fields. The grace period changes GSA’s enforcement posture for good-faith mistakes; it does not make applicable fields optional.
3. Report on one consistent basis. GSA permits invoice date or payment date. Choose the method that fits your commercial accounting practice and do not switch between them month to month.
4. Keep the scope clean. Include sales directly linked to the MAS contract, including applicable MAS BPA sales. Do not mix in unrelated commercial or government contracts.
5. Remit the full IFF on time. Sales are reported monthly, while the Industrial Funding Fee remains due quarterly unless you choose monthly payment. The reported total price includes IFF.

GSA may still issue automated compliance flags during the grace and trial periods. The User Guide expects contractors to use those notices to correct both the data and the reporting process. An accepted upload should therefore be treated as the beginning of feedback, not proof that every business decision in the file was correct.

05

For hourly services, the work happens below the invoice total.

The MAS-TDR User Guide tells contractors to report each hourly labor category individually. For a typical professional-services line, that means preserving enough source detail to support this chain:

• Use the order number supplied by the ordering agency, not the MAS contract number.
• Use a SIN awarded on your MAS contract and matching the order.
• If the labor category has a valid UCID, enter it exactly as shown in the Services Plus File and enter “N/A” for description.
• If it has no UCID, leave UCID blank and use the labor-category name exactly as shown on the GSA pricelist.
• Report invoice hours as quantity, the applicable hourly unit of measure, the invoiced hourly rate and a total equal to quantity multiplied by rate.
• For a federal sale, use the two-digit Treasury Agency Code of the agency that funded the requirement.

Order date, ship date and ZIP code shipped to are not required for an hourly labor-category line under Table 5.5. Fixed-price services, configurable services, products and order-level discounts follow different tables. Classify the sale first; then apply the corresponding instructions.

06

Use the remaining window to make the process repeatable.

The transition period is most valuable when each monthly close produces evidence for the next one. A practical sequence looks like this:

1. 1
   Confirm contract truth.

   Record the signed TDR effective date, awarded SINs, current catalog or Services Plus File, chosen invoice-or-payment basis and the people authorized in SRP.

2. 2
   Map each field to a source and an owner.

   “Federal customer comes from finance” is not a mapping. Identify the actual system field, who resolves blanks and what document settles an exception.

3. 3
   Reconcile before formatting.

   Tie the source-period total to included MAS sales, exclusions and adjustments. A perfectly shaped upload can still contain the wrong population.

4. 4
   Use the current template and review exceptions.

   Resolve catalog mismatches, missing agency codes, duplicate order lines and arithmetic differences before an authorized reviewer approves the file.

5. 5
   Preserve the feedback loop.

   Keep the exact reviewed source, output version, approval and SRP result together. Turn portal flags and corrections into rules for the next month.

07

What changes on January 1, 2027?

The underlying duty does not suddenly begin on January 1; it has already begun for contracts whose TDR effective date has arrived. What ends is GSA’s published commitment not to take enforcement action for covered good-faith field errors. The User Guide says a contracting officer can take enforcement action for noncompliance after the grace and trial periods.

The useful goal for December 31 is therefore not “submit everything at once.” It is “enter January with a monthly close that has already run, been reviewed, received SRP feedback and improved.”

GSA says the MAS-TDR User Guide will continue to evolve. Before every filing, check the live help page, the latest guide and the current SRP template. Your contract terms and contracting officer control if they conflict with general guidance.