Tools & calculators.

Every 25C cap and the uncapped 25D credit in one estimate, plus the credit limit worksheet: what your tax liability actually lets you claim.

The annual caps reset every January. Enter your project list and this schedules the work across years so the buckets waste as little credit as possible.

Compare your tax credits under the 2024 rules vs. the 2025 rules of Public Law 119-21 and see what the changes are worth on your projects.

Your quote and current bill in, the 30% credit, break-even year, and 25-year net savings out.

Seasonal heating costs at your actual utility rates, the electricity price where the furnace wins, and the $2,000 vs. $600 credit gap.

What an attic upgrade costs, the 30% materials credit, and the payback, with a DIY toggle that changes the math.