Can I send engagement letters to multiple clients at once?

Yes. zipzipdoc supports bulk sending — send the same type of contract to ten or more clients at once. Each receives a personalised document.

How do I archive contracts for audit purposes?

All documents are automatically archived in an encrypted cloud. You can export the entire archive for tax inspection or client audit needs.

What if a client needs a paper copy?

The signed PDF from zipzipdoc can be printed. For specific actions (notarised signatures) a physical original is required.

Does it work for clients from other EU countries?

Yes. zipzipdoc generates documents in 22 languages and eIDAS signatures are valid across the EU.

Professionals

Accountants & tax advisors

Engagement letters and authorisations for clients

Sign your engagement letter, power of attorney and GDPR consent with every client online — no office visit needed.

An accountant or tax advisor needs an engagement letter, power of attorney and GDPR consent from every client. These documents are traditionally handled on paper. zipzipdoc digitalises the whole process — clients sign online before the first meeting.

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GDPR compliant · EU-hosted

91 %

of accountants still use paper engagement letters

4.7 days

average time to obtain a signed power of attorney

30 min

saved per client per year through digitisation

100 %

of clients can sign online without assistance

What slows you down today

Paper authorisations get lost
Clients must come in person to sign
Archiving is disorganised

What you get with zipzipdoc

Online signing of engagement letters and powers of attorney
Automatic archive for audit
Bulk sending to clients

Day in the life

How it works in practice

A new client contacts the accountant. The accountant opens zipzipdoc, sends an engagement letter, power of attorney and GDPR consent in one bundle. The client signs on their phone, the accountant receives the PDF and can start work — without waiting for an in-person meeting.

How we help

Three things that change

Online signing of engagement letters and powers of attorney

Automatic archive for audit

Bulk sending to clients

“Clients sign engagement letters online before the first meeting. I've saved hours of unnecessary travel.”

Roman S., tax advisor

Relevant documents

Documents for you

Click any document to jump straight to a detailed guide.

Mandate agreement

For agents, representatives and mandates.

View guide

Power of attorney

Grant authority with clear scope and time limit.

View guide

GDPR consent

GDPR consent for marketing, recruiting, loyalty.

View guide

Invoice

Professional invoice with logo and VAT fields.

View guide

Consulting agreement

Fees, confidentiality and IP in one contract.

View guide

Frequently asked

Questions & answers

Electronically signed powers of attorney are accepted by most EU tax authorities. We recommend using a qualified electronic signature (QES) for actions requiring a higher level of verification.