Inflation Reduction Act Manufacturing Credits: 48C and 45X

The Inflation Reduction Act manufacturing tax credits are two federal incentives designed to move clean-energy production onto U.S. soil. The Section 48C Advanced Energy Project Credit offsets up to 30 percent of what a company spends to build or retool a qualifying factory. The Section 45X Advanced Manufacturing Production Credit pays a per-unit amount for every eligible component a manufacturer produces and sells. One rewards the investment; the other rewards the output. Both come with labor conditions, sourcing bonuses, and cash-out mechanisms that shape their real-world value.

Section 48C: The Investment Credit

Section 48C reimburses capital spending on facilities that produce clean-energy technology or cut industrial emissions. Qualifying projects include factories making fuel cells, energy storage systems, electric vehicles and their components, carbon capture equipment, solar energy property, and equipment used to process or recycle critical minerals. A facility that installs technology cutting its own greenhouse gas emissions by at least 20 percent also qualifies, even if it doesn’t produce clean-energy products.¹²

The credit equals 30 percent of the qualified investment when the project meets prevailing wage and apprenticeship labor standards. Without those standards, the rate drops to 6 percent. It applies to the building and permanent equipment, not to what comes off the line. Every 48C project must first go through a Department of Energy certification process; DOE evaluates the application and allocates a specific credit amount to approved applicants.¹

New 48C Applications Are Not Being Accepted

Read this before planning around 48C: the program is closed to new applicants. The IRA authorized $10 billion in total 48C allocations. The IRS awarded roughly $4 billion in March 2024 and the remaining $6 billion in January 2025, distributing the full pot.³ No further rounds are scheduled, and new applicants cannot receive a 48C award unless Congress authorizes more funding.⁴ Companies that received allocations in either round can still claim their credits as they complete their investments.

Section 45X: The Production Credit

Where 48C reimburses construction, 45X pays for output. Every time a manufacturer produces and sells an eligible component to an unrelated buyer, the company earns a credit set by the statute for that component. Production must happen in the United States or its possessions.⁵⁶

The rates come directly from the tax code and are not adjusted for inflation, so their real value drifts down each year. The major categories:

Thin-film and crystalline photovoltaic cells: 4 cents per direct-current watt of capacity.
Solar-grade polysilicon, solar wafers, and solar modules: fixed rates based on weight or capacity.
Wind blades: 2 cents per watt of the completed turbine’s rated capacity. Nacelles earn 5 cents per watt; towers earn 3 cents per watt.
Battery cells: $35 per kilowatt-hour of capacity.
Battery modules: $10 per kilowatt-hour, or $45 per kilowatt-hour for modules that don’t incorporate separate battery cells.
Inverters: rates from 0.25 cents to 2 cents per alternating-current watt depending on type.
Applicable critical minerals: 10 percent of the manufacturer’s production costs.

Critical Minerals

Section 45X carries a fixed statutory list of minerals whose domestic processing qualifies for the 10 percent production-cost credit. Commercially significant entries include aluminum, cobalt, graphite, lithium, manganese, and nickel. The full list also covers antimony, barite, beryllium, cerium, cesium, chromium, dysprosium, europium, fluorspar, gadolinium, germanium, indium, neodymium, niobium, tellurium, tin, tungsten, vanadium, and yttrium.⁷ Each mineral has a minimum purity threshold the finished product must meet. Metallurgical coal was added by later legislation at a lower 2.5 percent credit.

Simply mining raw ore doesn’t qualify. The credit covers the conversion or purification step, and the statutory list is fixed in the tax code; it doesn’t automatically follow changes to the separate U.S. Geological Survey list.

Prevailing Wage and Apprenticeship Requirements

Meeting labor standards is worth roughly 80 percent of a 48C credit’s total value. The base 48C rate is 6 percent, and the enhanced rate is 30 percent. Similar five-times multipliers apply across other IRA energy credits.⁸

The prevailing wage requirement means every laborer and mechanic working on construction or alteration of the facility must be paid at least the Department of Labor rate for that work in that geographic area, using the Davis-Bacon Act framework.⁹ The apprenticeship requirement sets a minimum share of total labor hours that must be performed by registered apprentices; for construction beginning in 2024 or later, that share is 15 percent.⁸ Payroll records must be detailed enough to prove compliance, including worker classifications, hours in each classification, and actual wage rates paid.

Domestic Content Bonus

Using American-made materials adds a bonus on top of the base credit. For investment credits, the bonus adds 10 percentage points to the credit rate. For production credits, it adds a 10 percent bump to the credit amount.¹⁰

Two tests apply. All steel and iron used in the project must be produced entirely in domestic mills, from initial melting through final forming. Then a minimum share of the total cost of manufactured products must come from domestic sources, on a rising schedule tied to when construction begins:

Construction starting through 2024: 40 percent.
Construction starting in 2025: 45 percent.
Construction starting in 2026: 50 percent.
Construction starting in 2027 or later: 55 percent.

The manufactured-product cost calculation looks at direct factory costs: production wages, payroll taxes on those wages, and payments to parts suppliers. IRS Notice 2024-41 provides safe-harbor tables that let developers use standardized cost percentages rather than gathering actual cost data from every supplier.¹¹ Even with the safe harbor, a detailed bill of materials tracing each component’s origin is what survives an audit.

How the Two Credits Interact

A company cannot claim both 48C and 45X on the same equipment. If a production line received a 48C allocation, the components coming off that line are ineligible for 45X.¹² Congress didn’t want a single asset subsidized twice.

The boundary sits at the production-line level, not the whole facility. A plant with multiple lines can use 48C for one and 45X for another. Equipment that makes subcomponents later assembled into a final eligible component on a different line isn’t treated as part of the 45X facility, so the restriction doesn’t sweep in every machine in the building.¹²

Turning Credits Into Cash

Two mechanisms convert these credits into money, and which one applies depends on the entity claiming.

Elective Pay

Elective pay under Section 6417 turns the credit into a direct government payment. The IRS treats the credit amount as a tax payment, creating an overpayment that gets refunded.¹³ The general eligibility list covers tax-exempt organizations, state and local governments, tribal governments, the Tennessee Valley Authority, Alaska Native Corporations, and rural electric cooperatives.

Manufacturers get a specific carve-out. Any taxpayer producing eligible components under Section 45X can elect direct pay for that credit, including a for-profit corporation. The same carve-out applies to the carbon capture credit and the clean hydrogen credit.¹⁴ That makes 45X one of the few IRA credits where a taxable manufacturer can simply receive a check from Treasury.

Transferability

Transferability under Section 6418 lets a company sell all or part of an eligible credit to an unrelated buyer for cash. The buyer then claims it on their own return. This route is available to any taxpayer who isn’t eligible for elective pay under the general categories, so it fits most for-profit businesses claiming credits other than 45X.¹⁵ Buyer and seller negotiate price privately; credits typically sell at a discount, meaning the seller collects somewhat less than face value.

Pre-Filing Registration

Both mechanisms require pre-filing registration through the IRS Energy Credits Online portal. Registration produces a unique number for each credit election, and that number must appear on the return for the election to be valid.¹⁶ Skipping this step before filing is one of the easiest ways to lose the credit for the year.

Filing and Documentation

The 48C credit is reported on IRS Form 3468 (Investment Credit), which flows into Form 3800 (General Business Credit).¹⁷¹⁸ These forms need total qualified investment costs and the DOE certification number.

For 45X, manufacturers need production logs showing the quantity and specifications of each eligible component produced and sold during the year. Battery cell producers must document kilowatt-hour capacity per cell. Solar cell manufacturers need wattage records. Critical mineral processors need cost accounting sufficient to calculate 10 percent of production costs.

Companies claiming the domestic content bonus should keep a bill of materials tracing every component’s origin and documentation of the direct factory costs behind the domestic cost percentage. Prevailing wage and apprenticeship records must identify each worker’s classification, hours in that classification, and wage rate; apprenticeship files should include proof of enrollment in a registered program. IRS review of energy credits can stretch over months, and gaps in documentation are the most common source of delay.

Phase-Out and Recent Changes

The 45X credit doesn’t last indefinitely. For most eligible components, credits phase out after December 31, 2029:⁵

2030: 75 percent of the full rate.
2031: 50 percent.
2032: 25 percent.
After 2032: eliminated.

Critical minerals phase out one year later: 75 percent in 2031, 50 percent in 2032, 25 percent in 2033, and zero after 2033.⁵

Later legislation accelerated some timelines. Wind energy component credits no longer apply to components produced and sold after 2027. Metallurgical coal has been added as an applicable critical mineral eligible for a 2.5 percent production-cost credit through 2029. Critical mineral producers also face new restrictions on sourcing from prohibited foreign entities. Anyone modeling projected credits from a new facility should use the current statutory schedule rather than the original 2022 IRA text.

For 48C, the constraint is different. The full $10 billion has been allocated across two rounds, and no new applications are being accepted absent further congressional action.³

1
Office of the Law Revision Counsel. 26 US Code 48C – Qualifying Advanced Energy Project Credit
2
Internal Revenue Service. Advanced Energy Project Credit
3
U.S. Department of the Treasury. US Department of the Treasury and IRS Announce 6 Billion in Tax Credit Allocations for the Second Round of the 48C Qualifying Advanced Energy Project Tax Credit
4
Department of Energy. Qualifying Advanced Energy Project Credit 48C Program
5
Office of the Law Revision Counsel. 26 US Code 45X – Advanced Manufacturing Production Credit
6
Internal Revenue Service. Advanced Manufacturing Production Credit
7
Office of the Law Revision Counsel. 26 USC 45X Advanced Manufacturing Production Credit
8
Internal Revenue Service. Frequently Asked Questions About the Prevailing Wage and Apprenticeship Under the Inflation Reduction Act
9
U.S. Department of Labor. Prevailing Wage and the Inflation Reduction Act
10
Internal Revenue Service. Domestic Content Bonus Credit
11
Internal Revenue Service. Domestic Content Bonus Credit Amounts Under the Inflation Reduction Act of 2022
12
Federal Register. Advanced Manufacturing Production Credit
13
Internal Revenue Service. Elective Pay and Transferability
14
Office of the Law Revision Counsel. 26 US Code 6417 – Elective Payment of Applicable Credits
15
Office of the Law Revision Counsel. 26 US Code 6418 – Transfer of Certain Credits
16
Internal Revenue Service. Register for Elective Payment or Transfer of Credits
17
Internal Revenue Service. About Form 3468, Investment Credit
18
Internal Revenue Service. About Form 3800, General Business Credit