Which date counts for the solar tax credit — install complete or PTO?

Homeowners and installers often hold three different dates: install-complete on the job packet, permission-to-operate (PTO) from the utility, and the installer invoice date. Which one “counts” for the residential clean energy credit depends on the tax rule year and how your facts map—not on a single marketing slogan.

What to check in the packet

• Install-complete language. What document proves the system was placed in service / install finished?
• PTO letter or portal stamp. Utility permission can lag weeks after physical install.
• Installer invoice and payment dates. Billing dates are not automatically the tax clock.
• Year boundary risk. Projects that span December–January create the most confusion; keep every date labeled.

What Install Clock does

Install Clock is a browser packet checker. You paste job-packet text and it flags clock forks among install-complete, PTO, and invoice-style dates. It does not compute your credit dollar amount and it is not tax advice.

The product exists because people ask “which date counts?” with a messy PDF in hand—not because a one-line blog answer fits every return.

Practical next steps

1. Gather the job packet, PTO notice, and installer invoice.
2. Paste into Install Clock and read the flagged forks.
3. Bring the dated packet to your tax preparer; do not rely on a tool as a filing instruction.
4. Use the guide for the install vs PTO framing.

If your search is specifically install-complete versus PTO, start here, then run the homepage check on your real documents.

Why install-complete and PTO both show up in arguments

Install crews mark a job complete when panels and inverters are up. Utilities issue PTO when the system may export or operate under their rules. Tax preparers care about placed-in-service style facts for the credit year. Those three conversations use different documents, so a homeowner hears three dates and asks which one “counts.”

Install Clock does not pick your filing position. It surfaces the forks in the packet so you and your preparer stop talking past each other. Bring the flagged dates to a qualified tax professional—especially on year-boundary installs.

Packet hygiene tips

• Keep PDFs labeled: job packet, PTO, invoice, payment receipt.
• Note time zones and “as of” stamps when portals show only a month.
• Do not discard emails that mention substantial completion versus PTO.
• If the installer invoice predates physical install, flag that explicitly.

Open Install Clock on the homepage with the real text pasted; use this page when the search question is install-complete versus PTO for the solar tax credit clock.

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