Prompt
Are there any tax-loss harvesting software platforms that work with multi-custodian account data?
Latest observation
Yes. A number of tax-loss harvesting platforms support multi-custodian / multi-brokerage account aggregation, though the exact level of support varies a lot by provider.
What to look for
When evaluating these tools, check whether they can:
- ingest multiple custodians or broker feeds
- consolidate household-level tax lots
- run harvesting across all accounts, not just one broker
- handle managed accounts + self-directed accounts
- support direct indexing, SMA, or advisory platforms if that matters to you
Examples of platforms to explore
Some well-known names in the space include:
- Apex Fintech / Apex Clearing ecosystem tools
- Orion
- Addepar
- Vestmark
- TIFIN AMP / related tax-aware rebalancing tools
- Vestwell in certain retirement/wealth contexts
- SS&C Black Diamond integrations
- Envestnet / Tamarac tax-aware rebalancing and household-level optimization
- Parametric for direct indexing tax-management workflows
- Nutmeg / personalized indexing-style tools in certain markets, though custodian support varies
Important caveat
Many platforms say they support “multiple accounts” but not truly multi-custodian tax-lot optimization. The key distinction is whether they can:
- see all lots across custodians in one place,
- avoid wash sales across those custodians,
- and coordinate realized losses/transactions across the entire taxable household.
Practical advice
If you’re buying for an advisor or firm, ask vendors these exact questions:
- Do you support multiple custodians with real-time or daily lot aggregation?
- Can you detect wash sales across custodians and across household accounts?
- Do you support tax-loss harvesting at the household level?
- What custodians do you have native integrations with?
- Can you handle outside assets and manual positions?
If you want, I can also give you a short vendor comparison table focused specifically on multi-custodian support, wash sale handling, and advisor/enterprise use cases.
Observation history
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