St. Louis property owners installing solar-integrated roofing can stack the 30% Federal Investment Tax Credit (ITC) with MACRS double-declining depreciation to recover a meaningful share of project costs in year one. Here's how the ITC + MACRS combination works for St. Louis homes and businesses.

What Is the Investment Tax Credit (ITC)?

The Federal Investment Tax Credit (ITC) lets property owners who install solar energy systems — including solar-integrated roofing and solar shingles — claim a credit equal to 30% of eligible system costs against their federal income tax liability. Unlike a deduction, a credit reduces tax owed dollar-for-dollar.

• 30% federal credit on qualified solar/roofing property
• Applies to solar shingles, solar tiles, and rooftop arrays
• Credit is non-refundable but can be carried forward if unused
• No Missouri state solar tax credit — the federal ITC is the primary lever here

What Is MACRS Double Declining Depreciation?

MACRS (Modified Accelerated Cost Recovery System) is the IRS-approved accelerated depreciation method. The double-declining balance (DDB) variant front-loads deductions, multiplying the straight-line rate by 2 and applying it to the remaining basis each year — recovering more value early when cash flow matters most.

• Solar roofing qualifies for a 5-year MACRS recovery period
• Double-declining balance accelerates deductions beyond straight-line
• Especially valuable for St. Louis businesses and rental property owners
• Residential rentals and commercial buildings benefit most from depreciation

The Half-Basis Reduction Rule

When you claim the ITC, IRS rules require you to reduce the depreciable basis by one-half of the ITC amount. So on a $100,000 solar roofing project, the 30% ITC is $30,000, and you reduce the depreciable basis by $15,000 — depreciating $85,000 rather than the full $100,000.

• Depreciable Basis = Gross Cost − ½ × ITC Amount
• $100,000 cost − $15,000 (½ of $30,000 ITC) = $85,000 depreciable basis
• This prevents double-counting the credit and depreciation on the same dollars
• Required by the IRS whenever the ITC is claimed

Stacking ITC + MACRS in St. Louis

For a St. Louis commercial building owner installing a $100,000 solar roof: claim the $30,000 ITC in year one, then depreciate the $85,000 adjusted basis over 5 years using MACRS double-declining. Combined, the credit plus accelerated depreciation can recover well over half the project cost in the first year for profitable businesses — and St. Louis's strong commercial real estate market makes this especially relevant for local property owners.

• Year-one cash benefit = ITC + first-year MACRS deduction value
• Net recovery can approach 60–70% of cost in year one for high-income taxpayers
• Missouri's flat 4.7% corporate tax amplifies state-level savings
• Local utilities (Ameren Missouri) may offer additional solar rebates

Actual savings depend on income, tax bracket, and entity type — a CPA can model your exact numbers.

Is MACRS Depreciation Mandatory?

MACRS is the default IRS depreciation system for most business property, but you can elect out of it (or out of the double-declining method) under certain circumstances. For most St. Louis property owners, staying in MACRS double-declining is advantageous because it accelerates deductions.

How a Solar Loan Gets You a New Roof — and All the Incentives

The smart play for many St. Louis property owners is to finance the solar-integrated roofing project and let the tax benefits pay down the loan. A solar loan spreads the upfront cost over time, and because the ITC, accelerated depreciation, and utility savings all land within the first year or two, you can use those savings to reduce or eliminate the loan balance — effectively getting a brand-new roof for little or no out-of-pocket.

• Finance the full project cost with a solar/roofing loan — $0 down in many cases
• Receive the 30% ITC at tax time and apply it straight to the loan principal
• Apply accelerated MACRS depreciation savings to the loan in year one
• Monthly Ameren Missouri electric savings help cover the loan payment
• Federal, state, and utility incentives all stack on top of the financing

Done right, the first-year tax benefits plus ongoing energy savings can exceed the loan's first-year cost — you get a new roof, lower energy bills, and a tax-funded paydown.

How This Applies to Your St. Louis Roofing Project

At Cox Roofing & Restoration, we install solar-ready and solar-integrated roofing systems across the St. Louis metro — from South County to West County to St. Charles. We document every component so your CPA has what's needed to separate solar property (5-year MACRS) from the structural roof (39-year commercial / 27.5-year residential).

• We provide line-itemized costs for solar vs. structural roofing
• Cost segregation-friendly documentation for your tax professional
• Insurance claim roof replacements can be paired with solar upgrades

Tax benefits vary based on your structure, income, and situation. Always consult your CPA before planning major capital expenditures — we provide the documentation, they provide the strategy.