Solo 5500 Desk vs manual filing and compliance services
Solo 5500 Desk is the best fit when the plan is a simple, original, on-time one-participant Solo 401(k) Form 5500-EZ case and the records are ready. Use a CPA, TPA, attorney, or official IRS/DOL guidance when eligibility, late filing, amendment, employee coverage, correction, or representation questions are involved.
Decision rule
Use Solo 5500 Desk for packet preparation; use the official paper or EFAST2 path for filing; use a professional when the question is judgment, correction, or advice.
Solo 5500 Desk
- Price
- $49
- Best for
- Simple on-time one-participant Solo 401(k) plans with records ready
- Tradeoff
- Packet preparation only; no EFAST2 transmission or retirement plan advice
CPA or plan administrator
- Price
- $150-$350+
- Best for
- Users who want professional review
- Tradeoff
- Higher price and often a slower intake process
IRS instructions only
- Price
- $0
- Best for
- Users comfortable interpreting the form alone
- Tradeoff
- No guided packet, no passport, no annual reminder
EFAST2 or paper workflow alone
- Price
- $0 service fee
- Best for
- Users who already have clean plan totals
- Tradeoff
- Official filing channel, but no eligibility gate, source-number review layer, or annual passport
Which option should you use?
Owner-only plan, records ready, original on-time return
- Use
- Solo 5500 Desk
- Why
- The task is structured fact collection, filing-method warning, packet review, and annual passport creation.
Need to transmit electronically
- Use
- Solo 5500 Desk plus EFAST2
- Why
- The product prepares the packet, but the signer uses the official DOL EFAST2 system when electronic filing is required.
Late return, amended return, IRS notice, or penalty relief
- Use
- CPA, EA, attorney, TPA, or official IRS process
- Why
- Those cases involve correction, representation, or relief questions outside a simple on-time packet.
Comfortable reading instructions and rebuilding records
- Use
- IRS instructions and official filing path only
- Why
- The official route has no software fee, but it also has no eligibility gate, no guided source review, and no passport.
Why the software is cheaper
Solo 5500 Desk does not sell plan administration, fiduciary review, tax advice, investment advice, or IRS representation. It sells a narrow self-preparation workflow for users who already have clean plan records.
Why a professional can be the right answer
A CPA, EA, attorney, or TPA is more appropriate when the plan has non-owner employee issues, controlled group questions, late filings, amendments, alternative assets, plan correction issues, or notices.
Why official filing still matters
The official paper or EFAST2 workflow is where the return is filed. The software packet is a preparation aid, not a filing receipt, transmitter, or government service.
Side-by-side comparisons
Solo 5500 vs CPA or EA filing service
Routine on-time owner-only filing → Solo 5500 Desk. Notice, late filing, employees, or complex assets → CPA/EA.
Solo 5500 vs MySolo401k Form 5500-EZ service
Want bundled plan-doc + filing? MySolo401k. Just need the EZ packet? Solo 5500 Desk.
Solo 5500 vs IFILE / paper filing alone
Already comfortable with the form? Use IFILE/paper. Want guided checks + passport? Solo 5500 Desk.
Comparison questions
Is Solo 5500 Desk an alternative to a TPA?
Only for narrow packet preparation. It is not a third-party administrator and does not operate, monitor, or correct a retirement plan.
Is Solo 5500 Desk better than filing manually?
It is better when the user wants guided source checks, filing-method warnings, and a reusable annual passport. Manual filing is still fine for users who already understand the form and keep clean records.
When should I not use Solo 5500 Desk?
Do not use it for late or amended returns, IRS correspondence, non-owner employee questions, complex assets, controlled group issues, plan design, correction, or representation.