Can I fax tax returns and IRS forms online?

Yes. BestFax lets you fax tax returns, IRS forms, and signed authorizations directly from your browser. Upload the PDF, enter the fax number, and send — with delivery confirmation within 2-5 minutes.

Is online faxing secure for client tax data?

Yes. BestFax encrypts your documents with TLS in transit, so client SSNs, financials, and tax documents are protected during transmission.

Will unlimited faxing cover tax season volume?

Yes. The $10/month unlimited plan has no per-page fees and covers up to 100 pages per fax, so even your busiest filing weeks never cost extra. You can also send a single fax for $4.95 with no subscription.

Can I sign engagement letters before faxing them?

Yes. Use the built-in PDF tools to sign and annotate engagement letters and authorization forms in your browser before sending — no printing or scanning required.

Online Fax for
Accountants & Tax Pros

Send tax returns, IRS forms, engagement letters, and signed authorizations from your computer or phone. No fax machine, no phone line — just secure, confirmed delivery through tax season and beyond. Unlimited faxing for $10/month.

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Everything you need to fax online

No fax machine required. Send documents from your computer or phone in minutes.

Fax returns and forms

Upload tax returns, IRS forms, and signed authorizations and fax them in minutes. Real-time confirmation on every document.

Sign and prep in-browser

Add signatures and notes to engagement letters and authorization forms right in your browser before faxing — no printing or scanning.

Secure transmission

Client SSNs, financials, and tax documents are encrypted with TLS in transit, with account-restricted access to stored documents.

Delivery confirmation

Know the moment the IRS, a client, or a financial institution receives your documents. A clear record for every filing.

Built for tax season

No per-page fees and up to 100 pages per fax, so heavy filing periods never cost extra. Send as many faxes as the season demands.

Organize your contacts

Save fax numbers for the IRS, lenders, and recurring clients so documents always go to the right destination.

Frequently Asked Questions

Can I fax tax returns and IRS forms online?: Yes. BestFax lets you fax tax returns, IRS forms, and signed authorizations directly from your browser. Upload the PDF, enter the fax number, and send — with delivery confirmation within 2-5 minutes.
Is online faxing secure for client tax data?: Yes. BestFax encrypts your documents with TLS in transit, so client SSNs, financials, and tax documents are protected during transmission.
Will unlimited faxing cover tax season volume?: Yes. The $10/month unlimited plan has no per-page fees and covers up to 100 pages per fax, so even your busiest filing weeks never cost extra. You can also send a single fax for $4.95 with no subscription.
Can I sign engagement letters before faxing them?: Yes. Use the built-in PDF tools to sign and annotate engagement letters and authorization forms in your browser before sending — no printing or scanning required.