What is Modified Total Direct Cost (MTDC)?

If you manage federal grants, you've encountered MTDC—Modified Total Direct Cost. It's the most common base for calculating indirect costs, and getting it wrong can mean leaving money on the table or facing audit findings.

This guide explains exactly what MTDC is and how to calculate it correctly.

MTDC in Plain English

Modified Total Direct Cost (MTDC) is your total direct costs, minus certain exclusions. It's used as the base for applying your indirect cost rate.

Think of it this way:

• Total Direct Costs (TDC) = Everything you charge directly to the grant
• MTDC = TDC minus specific exclusions
• Indirect Costs = MTDC × Your indirect cost rate

Why "Modified"?

The "modified" part refers to exclusions. Certain costs are removed from the base because:

1. They would distort the relationship between direct and indirect costs
2. They already carry their own indirect costs (like subawards)
3. Federal policy excludes them

What's Excluded from MTDC

Per 2 CFR 200 (Uniform Guidance), these are excluded:

1. Equipment

Equipment is excluded. Under the current 2 CFR 200.1 definition, equipment is tangible personal property with a useful life over one year and a per-unit acquisition cost at or above the lesser of the recipient's capitalization level or $10,000. The 2024 rule applies to an older award only if the agency elected to apply it or incorporated it through the applicable terms or funding action; check the award and agency implementation rather than changing classification automatically.

2. Capital Expenditures

Building renovations, land, infrastructure improvements.

3. Patient Care Costs

Costs of medical treatment (mainly for research institutions).

4. Rental/Lease of Real Property

Rent for buildings and land (but equipment rental IS included).

5. Tuition Remission

Graduate student tuition waivers.

6. Scholarships and Fellowships

Student financial aid.

7. Participant Support Costs

Stipends, travel, and subsistence for participants (not staff).

8. Subawards Over $50,000

Only up to the first $50,000 of each subaward is included, regardless of the subaward's period of performance. The excess is excluded. Contracts are not excluded by this subaward rule, which makes correct classification under 2 CFR 200.331 important.

The $50,000 Subaward Rule

This trips up many organizations. Here's how it works:

Scenario: You have a $100,000 subaward to a partner organization.

Component	Amount	In MTDC?
First $50,000	$50,000	Yes
Remaining $50,000	$50,000	No

Only $50,000 of this subaward counts toward your MTDC base.

Multiple Subawards: Apply the cap to each subaward, not each budget period. Do not reset it annually merely because the prime award or subaward has multiple budget periods.

MTDC Calculation Example

Let's calculate MTDC for a grant with these direct costs:

Cost Category	Amount
Personnel	$150,000
Fringe Benefits	$45,000
Travel	$10,000
Supplies	$15,000
Equipment (one item, $12,000; $10,000 capitalization level)	$12,000
Subaward to Partner A	$60,000
Subaward to Partner B	$20,000
Participant Stipends	$5,000
Total Direct Costs	$317,000

Now calculate MTDC:

Item	Calculation	Adjustment
Equipment	$12,000	-$12,000
Subaward A over $50K	$60,000 - $50,000	-$10,000
Subaward B	$20,000 (under $50K)	$0
Participant Stipends	$5,000	-$5,000
Total Exclusions		-$27,000

MTDC = $317,000 - $27,000 = $290,000

If your indirect rate is 15%: Indirect Costs = $290,000 × 15% = $43,500

MTDC vs. Other Bases

Federal grants may use different indirect cost bases:

Base	What's Included	When Used
MTDC	TDC minus exclusions	Most common
TDC	All direct costs	Some grants
Direct Salaries & Wages	Personnel costs only	Research institutions
Direct Salaries, Wages & Fringe	Personnel + benefits	Some organizations

Your negotiated rate agreement specifies which base to use.

Getting Your MTDC Right

Step 1: Know Your Exclusions

Review the MTDC definition in 2 CFR 200.1 and the base in the applicable negotiated rate agreement or award. Do not add exclusions solely as a matter of preference.

Step 2: Track Subawards Carefully

Maintain clear records of:

• Each subaward total
• Cumulative amount included in the first $50,000 vs. excluded excess

Step 3: Classify Equipment Properly

Track individual items and the organization's capitalization level. At a $10,000 capitalization level, a $10,000 item meeting the useful-life test is equipment and excluded; ten independent $1,000 items generally are supplies and remain in MTDC. Component rules and award terms can affect classification.

Step 4: Separate Participant Costs

If you have participant support, track it separately from staff costs.

Step 5: Document Everything

Auditors will test your MTDC calculation. Keep supporting documentation for all exclusions.

Common MTDC Mistakes

Mistake 1: Using the Old $5,000 Ceiling Automatically

The 2024 definition raised the federal ceiling to $10,000, but the applicable threshold is the lesser of $10,000 or the recipient's capitalization level, and an older award may retain older terms.

Mistake 2: Forgetting the $50K Subaward Inclusion

People remember to exclude amounts over $50K but forget to INCLUDE the first $50K.

Mistake 3: Excluding Equipment Rental

Real property rental is excluded. Equipment rental is NOT excluded.

Mistake 4: Resetting the Subaward Cap Each Year

The current definition says up to the first $50,000 of each subaward, regardless of its period of performance. It does not provide an annual reset.

Mistake 5: Using Wrong Base

If your rate agreement says "MTDC" but you use TDC, you'll over-claim and face audit findings.

MTDC and Grant Budgeting

When building a grant budget:

1. Calculate direct costs by category
2. Identify exclusions and sum them
3. Calculate MTDC = TDC - Exclusions
4. Apply indirect rate to MTDC
5. Total budget = TDC + Indirect

Budget template structure:

Personnel:           $150,000
Fringe:              $45,000
Travel:              $10,000
Supplies:            $15,000
Equipment:           $12,000  [Excluded from MTDC]
Subaward A:          $60,000  [$10K excluded from MTDC]
Subaward B:          $20,000
Participant Support: $5,000   [Excluded from MTDC]
-----------------------------
Total Direct:        $317,000
MTDC Base:           $290,000
Indirect (15%):      $43,500
-----------------------------
Total Budget:        $360,500

De Minimis Rate Option

Don't have a negotiated rate? You may use the 15% de minimis rate per 2 CFR 200.414(f):

• Applied to MTDC
• A recipient or subrecipient without a current federally negotiated indirect cost rate may elect it; having had an expired rate no longer permanently disqualifies an organization
• No rate negotiation or proof of actual indirect costs is required, but the election, base, consistent application, and claimed costs still need support
• May be lower than a negotiated rate would be

Tools for MTDC Tracking

Managing MTDC manually is error-prone. Consider:

• Grant management software that tracks exclusions automatically
• Spreadsheet templates with built-in exclusion logic
• Accounting system configuration that flags excluded costs

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How GrantLink supports this today

QuickBooks Online remains the accounting source of truth. Link each grant's Expenses to relevant QBO activity; GrantLink backfills and auto-allocates eligible linked activity, while Ledger, Todos, and manual allocation handle exceptions. Reports start in Chats > New Chat and then appear in the grant Reports tab. Allocations do not inherently rewrite QBO; writes require explicit permission and workflow.

Authoritative sources: current 2 CFR 200.1 (MTDC and equipment definitions), 2 CFR 200.414 (indirect costs and de minimis rate), and the 2024 final guidance and effective-date notice.