Modified Total Direct Cost: Base, Exclusions, and De Minimis Rate

Modified Total Direct Cost, or MTDC, is the calculation base federal grant recipients use to figure out how much indirect cost recovery they can claim on an award. Defined at 2 CFR ยง 200.1 in the Uniform Guidance, it takes your total direct costs, strips out high-dollar items that don’t drive proportional administrative burden, and leaves a figure you then multiply by your indirect cost rate. The 2024 revision to the Uniform Guidance changed several of the thresholds inside that calculation, so budgets prepared today follow different numbers than budgets prepared a year ago.1Federal Register. Guidance for Federal Financial Assistance

What Goes Into the MTDC Base

The base captures the cost categories that reflect the ordinary administrative work of running an award. Included are:

  • Salaries and wages for personnel working directly on the project
  • Fringe benefits tied to those employees, including health insurance, retirement contributions, and payroll taxes
  • Materials and supplies consumed during the grant period
  • Services purchased from outside vendors under procurement contracts
  • Travel costs, including transportation, lodging, and per diem
  • The first $50,000 of each subaward

The $50,000 subaward figure took effect October 1, 2024. Before that date, only the first $25,000 of each subaward was includable.1Federal Register. Guidance for Federal Financial Assistance Read the phrase “each subaward” carefully. If your project has three subawards, you include up to $50,000 from each one separately, not $50,000 combined.2eCFR. 2 CFR 200.1 – Definitions

What Gets Excluded

The whole reason for using a “modified” base rather than total direct costs is to strip out items that carry large price tags but don’t proportionally add to your organization’s overhead work. A $300,000 piece of lab equipment doesn’t triple the workload of your HR or accounting departments. The following categories must come out of the base before you apply your rate:

  • Equipment: tangible items with a useful life exceeding one year and a per-unit cost at or above $10,000, or your organization’s capitalization threshold, whichever is less
  • Capital expenditures on land, buildings, or building improvements
  • Patient care charges in medical research settings
  • Rental costs for off-site facilities
  • Tuition remission for graduate students working on the project
  • Scholarships and fellowships
  • Participant support costs (stipends, travel, and subsistence paid to individuals attending training or conferences as project participants)
  • Subaward amounts exceeding $50,000 per subaward

The equipment threshold is another figure the 2024 revision moved. Under the prior rules, equipment was defined at $5,000 or more. It’s now $10,000.2eCFR. 2 CFR 200.1 – Definitions An $8,000 instrument that would have been excluded before now stays in the base, provided your internal capitalization policy doesn’t set a lower floor. If your organization capitalizes assets at $5,000, that lower figure controls, and the item still comes out.

Subrecipient or Contractor? It Changes the Math

The $50,000 cap only applies to subrecipients. Contractors are treated differently, and misclassifying the relationship is one of the fastest ways to miscalculate the base. The two arrangements can look similar on paper, so the distinction turns on substance rather than the label your organization puts on the agreement.3eCFR. 2 CFR 200.331 – Subrecipient and Contractor Determinations

A subrecipient carries out part of the federally funded program itself. Picture a university that receives NIH funding and subawards a portion of the research to another institution. That second institution makes programmatic decisions, is measured against the federal program’s objectives, and must comply with federal award requirements. The $50,000 MTDC cap applies.

A contractor provides goods or services that your organization consumes. A lab supply company, a data analytics firm running statistical models, a consulting firm doing market analysis. These entities sell within their normal business operations, serve many purchasers, and operate competitively. Payments to contractors fall under “services” in the MTDC base and are generally included in full with no cap.3eCFR. 2 CFR 200.331 – Subrecipient and Contractor Determinations

No single factor decides the question. Your organization must make a case-by-case judgment based on what the other entity is actually doing. Getting it wrong cuts both directions. Calling a subrecipient a contractor inflates your base and your recovery; calling a contractor a subrecipient deflates it.

Calculating MTDC and Applying Your Rate

The math is straightforward once your cost classifications are clean. Start with your total direct costs (every allowable expense charged to the award). Subtract the excluded items: equipment at or above the applicable threshold, capital expenditures, patient care, rental costs, tuition remission, scholarships, fellowships, participant support, and any subaward amounts above $50,000 per subaward. What remains is your MTDC base.

Multiply the base by the percentage in your Negotiated Indirect Cost Rate Agreement (NICRA), or by the de minimis rate if you’ve elected one. The result is your indirect cost recovery for the award period.

A worked example: total direct costs of $500,000, excluded items of $120,000, and a negotiated rate of 45 percent. $500,000 minus $120,000 gives a $380,000 MTDC base. $380,000 times 0.45 gives $171,000 in indirect cost recovery.

A NICRA is a formal agreement between your organization and a cognizant federal agency, generally the agency providing the largest dollar amount of your federal funding. It specifies your approved rate and the base to which it applies. Organizations that have never negotiated one can submit a cost allocation proposal, or use the de minimis rate in the meantime.4eCFR. 2 CFR 200.414 – Indirect Costs

The De Minimis Rate

You don’t need a negotiated rate to recover overhead. Organizations without a current negotiated rate, including a provisional rate, can elect a de minimis rate of up to 15 percent of MTDC.4eCFR. 2 CFR 200.414 – Indirect Costs The 2024 revision raised this from 10 percent, which is a meaningful bump for smaller nonprofits and community organizations receiving federal pass-through funding.

The de minimis rate has practical advantages. No documentation is required to justify it. It can be used indefinitely. You can pick any percentage up to 15 (it doesn’t have to be exactly 15). Federal agencies and pass-through entities cannot force you below the rate you elect.4eCFR. 2 CFR 200.414 – Indirect Costs

Two constraints matter. Once you elect the de minimis rate, you must apply it across all your federal awards. You also need to be consistent about which costs are direct and which are indirect. A cost charged directly to one award can’t show up in the indirect pool on another. That consistency requirement is where smaller organizations often stumble in audits.

Agency Rate Caps and Unrecovered Indirect Costs

Having a negotiated rate doesn’t guarantee you can charge it. The Uniform Guidance says federal agencies must accept negotiated rates, but it also permits agencies to use a different rate when required by statute or regulation, or when the agency has published its deviation policies.4eCFR. 2 CFR 200.414 – Indirect Costs

Many grant programs impose caps well below what large research institutions negotiate. NIH training and career development awards cap indirect costs at 8 percent of MTDC. USDA research programs under NIFA cap recovery at 30 percent of total federal funds. The Cooperative Ecosystem Studies Units program limits rates to 17.5 percent of total direct costs. Caps vary by agency, by program, and sometimes by recipient type.

The gap between your negotiated rate and what a specific award allows produces “unrecovered indirect costs.” An organization with a 52 percent negotiated rate working under an award capped at 8 percent absorbs the difference. Those administrative costs still exist; they just aren’t reimbursed by that grant. Pass-through entities cannot cap your rate below the federally negotiated amount.4eCFR. 2 CFR 200.414 – Indirect Costs

When an award requires cost sharing or matching funds, unrecovered indirect costs can help meet that obligation. The difference between what your negotiated rate would have yielded and what the award actually reimburses counts as cost sharing, but only with prior approval from the awarding federal agency or pass-through entity.5eCFR. 2 CFR 200.306 – Cost Sharing For an organization with a 48 percent negotiated rate working under a 15 percent program cap, the 33-point difference represents real institutional cost. With the right approvals, that gap can satisfy part of a mandatory cost share, reducing the cash your organization has to pull from other sources.

Common MTDC Mistakes and Audit Exposure

Organizations spending $1,000,000 or more in federal awards during a fiscal year are subject to a Single Audit, and the MTDC calculation is a standard area of review. Auditors verify that excluded items were actually removed, that the rate applied matches the NICRA or de minimis election, and that costs classified as direct weren’t also folded into the indirect cost pool.

The most common error is failing to strip out items that belong outside the base. Participant support costs, subaward amounts over $50,000, and equipment often get left in. For organizations on the de minimis rate, the typical miss is failing to remove rental costs or subaward overages before applying the 15 percent.

The consequences of overclaiming are concrete. Costs determined to be unallowable must be refunded to the federal government with interest. If a previously negotiated rate turns out to have been built on a proposal containing unallowable costs, the rate itself is adjusted, and your organization must compute the federal share of the overcharge for each year involved and return it as cash. This happens whether your rate was predetermined, provisional, or final.6eCFR. 2 CFR Part 200 Subpart E – Cost Principles

For organizations working under federal contracts rather than grants, the exposure is sharper. The Federal Acquisition Regulation imposes a penalty equal to the disallowed amount plus interest for expressly unallowable costs, and double the disallowed amount for costs previously flagged as unallowable.7Acquisition.GOV. FAR 52.242-3 Penalties for Unallowable Costs Getting the base right up front is far cheaper than fixing it after an auditor finds the problem.