How To Calculate Indirect Costs For Federal Grants

Federal Grants Calculator

Use this premium calculator to estimate your indirect cost recovery under a negotiated rate, the 10% de minimis rate, or a simplified salaries and wages base. Then review the expert guide below to understand modified total direct costs, exclusions, subaward rules, and practical proposal strategy.

Indirect Cost Calculator

Enter your project budget categories, choose your base, and apply the rate you are allowed to use. This tool calculates the estimated indirect amount, total direct costs, total project cost, and the base used for the calculation.

• MTDC generally excludes equipment and the portion of each subaward above $25,000.
• The 10% de minimis rate applies to MTDC for entities eligible to use it.
• Always confirm sponsor specific rules, your negotiated agreement, and current Uniform Guidance interpretations.

Expert Guide: How to Calculate Indirect Costs for Federal Grants

Indirect costs for federal grants are one of the most misunderstood parts of proposal budgeting. Many applicants know their direct costs because those are easy to see: salaries, travel, supplies, and equipment. The challenge is determining the correct indirect cost amount, sometimes called facilities and administrative costs, overhead, or F&A. If the calculation is wrong, a proposal can be underfunded, noncompliant, or less competitive than it should be. If the calculation is done correctly, the grant budget is more realistic and the organization is far better positioned to recover the actual infrastructure costs required to support the project.

At a basic level, indirect costs are expenses that cannot be identified readily and specifically with a single grant, contract, project, function, or activity. They often include accounting, payroll, compliance, procurement, IT, facilities, utilities, general administration, and other institutional support functions. Federal agencies do not want organizations to simply guess at these costs. Instead, the federal system relies on approved methodologies and recognized cost bases, especially under Uniform Guidance principles.

This guide explains how to calculate indirect costs for federal grants in a practical way. You will learn the formula, the common base types, what modified total direct costs means, how subawards are handled, how the 10% de minimis rate works, and the mistakes that most often distort budgets.

Indirect Costs = Indirect Cost Rate x Allowable Indirect Cost Base

Step 1: Identify your organization’s allowable indirect cost rate

The first step is to determine which rate you are allowed to use. In federal grant budgeting, the rate usually falls into one of three categories:

• Negotiated rate: Your organization has an approved indirect cost rate agreement, often called a NICRA, negotiated with a federal cognizant agency or pass through entity.
• Provisional or predetermined rate: Some organizations operate under a provisional arrangement that is later adjusted, while others may have a fixed or predetermined rate for a specified period.
• 10% de minimis rate: Organizations that have never received a negotiated rate and are eligible under federal rules may elect to charge 10% of modified total direct costs.

If you have a negotiated rate agreement, start there. The rate agreement tells you both the percentage and the base. A rate without the base is incomplete because 20% of salaries and wages is very different from 20% of total direct costs or 20% of modified total direct costs. If you do not have a NICRA and the funding opportunity permits the de minimis rate, the de minimis option can provide a compliant way to recover at least part of your overhead.

Federal budgeting benchmark	Value	Why it matters	Typical effect on the budget
De minimis indirect cost rate	10%	Available to eligible entities that have never had a negotiated rate	Creates a standard overhead recovery method on an MTDC base
Subaward amount included in MTDC	First $25,000	Amounts above this threshold are generally excluded from the MTDC base	Large subawards often generate much less indirect recovery than applicants expect
Federal equipment threshold commonly referenced in Uniform Guidance	$5,000	Items meeting the equipment definition are often excluded from MTDC	High equipment budgets can reduce the indirect cost base substantially

Source benchmarks based on federal Uniform Guidance concepts and common federal grant budgeting practice.

Step 2: Determine the correct indirect cost base

The base is the pool of direct costs to which the indirect rate is applied. This is where many budgeting errors occur. The same rate can produce very different results depending on the base. The most common bases are:

• Modified Total Direct Costs (MTDC): Often includes direct salaries and wages, applicable fringe benefits, materials and supplies, services, travel, and the first $25,000 of each subaward or subcontract.
• Total Direct Costs (TDC): Includes all direct cost categories without the same exclusions used in MTDC, if your agreement specifically uses TDC.
• Salaries and wages only: Applies the indirect rate only to direct salary and wage expense.
• Salaries, wages, and fringe: Uses compensation plus fringe benefits as the base.

The federal government does not assume one universal base for every recipient. Your approved rate agreement, sponsor policy, or program announcement governs the calculation. The calculator above lets you model several common structures, but the official base must always come from the governing grant rules and your approved documentation.

What counts in MTDC and what is usually excluded?

Modified total direct costs is the base many applicants encounter first because it is tied to the de minimis rate and widely used in higher education, nonprofit, and public sector grant budgeting. MTDC usually includes standard project operating costs, but it excludes selected categories. The most common exclusions are equipment, capital expenditures, charges for patient care, rental costs, tuition remission, scholarships and fellowships, participant support costs, and the portion of each subaward in excess of $25,000.

That means you cannot simply total the budget and multiply by the rate. For example, if your project has $300,000 in direct costs but includes $100,000 in equipment and a $90,000 subaward, your MTDC base may be much lower than the total direct cost number. Under a simplified MTDC example, only the first $25,000 of that subaward would remain in the base, and the equipment would likely be excluded entirely.

Step 3: Add up direct costs correctly before applying exclusions

Before calculating the base, build a complete direct cost budget. This normally includes:

1. Personnel salaries and wages.
2. Fringe benefits if they are charged separately.
3. Travel.
4. Supplies and materials.
5. Equipment.
6. Consultants or contractual services.
7. Subawards.
8. Other direct costs such as publication, communications, software, or evaluation.

Once all direct costs are identified, you can calculate total direct costs. Then you determine the allowable base by subtracting excluded items if your rate uses MTDC or another limited base. Only after that step should you apply the percentage rate.

Step 4: Apply the formula

The actual indirect cost calculation is straightforward after the rate and base are known:

1. Calculate total direct costs.
2. Calculate the allowable indirect cost base.
3. Convert the rate percentage to a decimal.
4. Multiply the base by the rate.
5. Add indirect costs to total direct costs to get total project cost.

For example, assume the following project budget:

• Salaries and wages: $180,000
• Fringe benefits: $54,000
• Travel: $20,000
• Supplies: $18,000
• Equipment: $40,000
• Other direct costs: $12,000
• Subaward: $80,000

Total direct costs equal $404,000. If the organization uses the 10% de minimis rate on an MTDC base, equipment is excluded and only $25,000 of the subaward is included in the base. A simplified MTDC base would therefore be $180,000 + $54,000 + $20,000 + $18,000 + $12,000 + $25,000 = $309,000. Indirect costs would be $30,900. Total project cost would be $434,900.

Key budgeting insight: the biggest driver of federal indirect cost recovery is not always the percentage itself. In many proposals, the base definition has the largest impact. A 10% rate applied to the correct MTDC base can be more defensible than an inflated custom rate applied to the wrong base.

Common comparison: MTDC versus total direct cost

Applicants often assume that using total direct costs will yield the same answer as MTDC. It will not. The difference can be dramatic when the budget includes equipment, participant support, or large subawards. The table below shows how the same budget can change depending on the base used.

Scenario	Rate	Base amount	Indirect costs	Comment
MTDC with equipment exclusion and subaward capped at first $25,000	10%	$309,000	$30,900	Typical de minimis style calculation
Total direct cost base on the same underlying budget	10%	$404,000	$40,400	Higher recovery because exclusions do not apply
Salaries and wages only base	10%	$180,000	$18,000	Common in some restricted or legacy rate structures
Salaries, wages, and fringe base	10%	$234,000	$23,400	Higher than salaries only, lower than MTDC

Comparison uses the same sample direct cost budget and illustrates the impact of different federally recognized base structures.

How subawards affect the calculation

Subawards are one of the most important indirect cost issues in federal budgets. Under MTDC, only the first $25,000 of each subaward is generally included in the base for the life of the subaward. That means a $300,000 subaward usually does not generate indirect costs on all $300,000. It may generate indirect costs on only the first $25,000, assuming MTDC applies. Organizations that forget this rule can overstate the budget and create internal shortfalls when the award is made.

Also remember that your subrecipient may apply its own approved indirect cost rate to its own budget. In other words, the prime recipient’s indirect cost recovery and the subrecipient’s indirect cost recovery are separate calculations governed by different rate agreements and cost bases.

When the 10% de minimis rate is useful

The de minimis rate is especially useful for smaller nonprofits, start up research entities, community based organizations, and other first time federal applicants that do not yet have a negotiated indirect cost rate. It provides a standardized, recognized overhead approach without requiring a full rate proposal at the outset. However, the de minimis rate is not automatically better than a negotiated rate. For organizations with significant infrastructure costs, the actual overhead burden may be much higher than 10%, so a negotiated agreement may be more financially sustainable over time.

Frequent mistakes that lead to underbudgeting or noncompliance

• Applying the rate to total project cost instead of the approved direct cost base.
• Forgetting to exclude equipment or participant support from an MTDC base.
• Charging indirect costs on the entire amount of a subaward instead of only the allowable portion under MTDC.
• Using a negotiated rate percentage with the wrong base type.
• Ignoring sponsor limits that cap indirect costs below the organization’s negotiated rate.
• Failing to document the assumptions used to build the budget.
• Using outdated rate agreements or expired institutional policies.

How to document your calculation for proposal files

Every proposal should retain a simple audit trail showing how indirect costs were computed. That documentation should include the approved rate agreement or justification for the de minimis election, the base definition, the budget categories included in the base, any excluded categories, and the arithmetic showing the final amount. This matters not just at submission, but also during award negotiation, monitoring, audit, and closeout.

A good internal file usually includes a one page indirect cost worksheet. That worksheet should show direct cost totals, excluded categories, net base, rate, calculated indirect amount, and final total project cost. If there is a sponsor cap, show both the fully allowable amount and the sponsor limited amount so leadership understands whether cost sharing or unrecovered indirect costs are being created.

Best practices for universities, nonprofits, and public agencies

Although the rules are broadly federal, organizations implement them differently. Universities often have detailed sponsored programs offices and negotiated F&A agreements with on campus and off campus rates. Nonprofits may rely on the de minimis rate for early awards and later seek a negotiated agreement. Public agencies may work under state level cost allocation plans or federally approved rates. In all cases, the best practice is the same: use the governing rate document, confirm the correct base, and align the proposal narrative with the budget worksheet.

If your project spans multiple years, be careful to apply the correct rate in each budget period. Some agreements permit escalation or specify different treatment depending on location, program type, or period of performance. Multi year forecasting errors can become material very quickly, especially when labor costs rise year over year.

Authoritative sources you should review

For official guidance, review federal and university resources that explain indirect cost methodology and Uniform Guidance concepts in detail. Helpful sources include the Electronic Code of Federal Regulations for 2 CFR Part 200, the National Institutes of Health Grants Policy Statement on facilities and administrative costs, and educational material from institutions such as the University of North Carolina research administration guidance on F&A costs.

Final takeaway

To calculate indirect costs for federal grants, do not start with the percentage alone. Start with the governing rate authority, confirm the cost base, build the direct cost budget accurately, remove exclusions where required, and only then apply the rate. This sequence is the difference between a defensible federal budget and a risky estimate. If you use the calculator above as a planning tool and validate the final numbers against your approved rate agreement and sponsor guidance, you will be far closer to a compliant and financially realistic proposal.

Important: This calculator is a planning aid, not legal or audit advice. Federal agencies, pass through entities, and institutional policies may impose additional rules, caps, exceptions, or sponsor specific definitions that change the result.