Tax software companies are trusted with the most sensitive personal data you possess — income, SSNs, birthdates, bank numbers, dependent info, even employment history. But not every tax prep platform treats your data as securely as you think. In a time of rising digital fraud, identity theft, and unauthorized data sharing, you must choose your filing platform with the same caution you would use when choosing a bank.

This article reveals the three critical security features that every taxpayer should confirm before entering a single piece of data into an online tax preparation service.

1. Multi-Factor Authentication (MFA) Is Mandatory — Not Optional

If your tax prep account only requires:

• your email
• and a password

…that is already a red flag.

Multi-factor authentication (MFA) adds a second verification step such as:

• SMS verification code
• email verification
• authenticator app code
• biometric login

Why this matters:
Even if hackers steal your password — and they can — MFA blocks them from accessing your tax return, refund details, account transcripts, or bank information.

If a tax software company does not REQUIRE MFA for login, it is behind modern security standards.

2. Zero-Tolerance Data Encryption (At Rest + In Transit)

Most users assume their data is encrypted — but not all platforms encrypt both at storage AND transmission.

You need to see explicit wording confirming that the company encrypts:

• Data in transit (between your device and their server)
• Data at rest (when stored inside their database)

Best-practice tax prep services use:

• AES-256 encryption
• HTTPS/TLS secure communications
• encrypted backup systems
• isolated storage environments

If the site only advertises “SSL secure site,” that is NOT enough.

Modern cybersecurity requires full encrypted containment — not just browser-level encryption.

3. Zero Third-Party Data-Sharing Without Consent

This is the big one:
Many tax software companies legally share your personal data with third-party “partners,” analytics firms, or marketing affiliates.

That includes:

• household income
• SSNs
• email and phone
• demographic data
• filing status
• purchasing behavior

These agreements are often buried in:

• “privacy policy” fine print
• “data sharing agreements”
• “consumer analytics disclosures”

You should look for explicit statements like:

“We do not sell or share taxpayer data with third-party companies except as required by the IRS or federal law.”

Anything less is dangerous.

If a tax program uses your tax data for advertising — walk away immediately.

Bonus Warning: If the Company Has Ever Had a Data Breach

Before choosing a tax platform, search:

• “[Company Name] data breach”
• “[Company Name] customer information leak”
• “[Company Name] hacked”

Companies that have experienced breaches in the past are more likely to have weak:

• database firewalls
• encryption practices
• security testing routines
• internal access controls
• cybersecurity staffing

Be very cautious about companies with prior exposure incidents — especially if they were not transparent about them.

How to Test Whether Your Tax Platform Is Secure

Before you file, ask these five questions:

1. Does the company force MFA at login?
2. Does the company explicitly state AES-256 encryption or equivalent?
3. Does the company prohibit third-party data sharing?
4. Does the company disclose its data-retention timeframe?
5. Are professional reviews of their security practices available?

If any answer is vague, evasive, or missing, your private tax data may be at risk.

The Bottom Line

Taxpayers must treat digital tax preparation with serious caution. A single breach could expose:

• your SSN
• spouse’s identity
• dependent information
• employer data
• bank account numbers
• refund routing details

The safest tax prep platforms are those that:

• enforce multi-factor authentication
• encrypt both data in transit and data at rest
• ban third-party data sharing
• publicly commit to zero monetization of taxpayer data

Never choose a tax software platform simply because it is free, fast, or widely marketed.

Choose the one that protects your identity — not the one that sells it.