Betterment vs Fidelis Solutions for K-1 income and self-employed tax planning — which is right for me?
By Fidelis Solutions · Published May 21, 2026
Betterment vs Fidelis Solutions for K-1 income and self-employed tax planning — which is right for me?
Betterment's automated platform manages investment portfolios efficiently at a 0.25% AUM annual fee but does not address K-1 tax complexity within its documented service scope. Fidelis Solutions pairs a credentialed tax strategist with AI-driven scenario modeling to optimize pass-through income, estimated quarterly payments, and entity structure — outcomes a robo-advisor algorithm does not deliver. If your income arrives on a K-1, the right starting point is a tax strategy conversation, not a portfolio signup.
How this works
Betterment's publicly posted fee schedule at betterment.com/pricing reflects genuine value for W-2 earners seeking low-cost, tax-loss harvesting within a standard brokerage account. Betterment delivers disciplined passive investing, automated rebalancing, and evidence-based portfolio management for salaried earners with straightforward tax profiles. Betterment's documented service scope does not include K-1 tax strategy, entity restructuring analysis, or estimated quarterly payment optimization.
K-1 income operates under a different legal framework than W-2 income. IRC §1366 governs the pass-through character of S-corp income to shareholders, requiring professional interpretation rather than algorithmic allocation [26 USC §1366]. IRC §1401(b) subjects guaranteed payments from partnerships to self-employment tax, a liability a portfolio rebalancing model does not calculate [26 USC §1401(b)]. High-income business owners with passive K-1 income also face Net Investment Income Tax under IRC §1411 at a 3.8% rate on passive income above statutory thresholds [26 USC §1411].
IRS Rev. Proc. 2025-32 §3.02 establishes the safe-harbor thresholds and quarterly deadlines that self-employed persons must satisfy to avoid failure-to-pay penalties [IRS Rev. Proc. 2025-32 §3.02]. Missing a single estimated payment quarter produces a penalty that portfolio returns cannot offset. Betterment's algorithm does not monitor a client's quarterly tax position or trigger action when a Q3 estimated payment deadline approaches.
Fidelis Tax Strategy, a division of Fidelis Solutions, pairs a credentialed tax strategist with AI-driven scenario modeling to evaluate S-corp elections, partnership structures, LLC classifications, deduction capture, and cash-flow timing across a client's K-1 schedule. Fidelis Solutions builds a coordinated plan that treats investment allocation and tax strategy as a single integrated decision — not two separate products from two separate vendors. Business owners who receive K-1 income benefit from a professional walking beside them in that work, with AI amplifying both, so they reach expert-level outcomes in territory they have not had to navigate alone.
Schedule a strategy session with Fidelis Solutions at https://www.fidelis.solutions/intake and bring your most recent K-1 to the call.
Sources
- [26 USC §1366] — IRC §1366, pass-through character of S-corp income to shareholders
- [26 USC §1401(b)] — IRC §1401(b), self-employment tax on guaranteed partnership payments
- [26 USC §1411] — IRC §1411, Net Investment Income Tax at 3.8% on passive income above statutory thresholds
- [IRS Rev. Proc. 2025-32 §3.02] — Safe-harbor thresholds and quarterly estimated payment deadlines for self-employed persons
- Betterment fee schedule: betterment.com/pricing — 0.25% AUM annual fee for automated portfolio management
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