A family office platform is the software a family office uses to keep its books and track its investments across every entity it manages. Offices put one together in two ways: they buy an all-in-one suite from a single vendor, or they connect best-of-breed tools around one central set of books.
Either model can work. The first decision is which system holds the official books, because reporting, integrations, and AI tools all read from it. Most offices start with an accounting system that fits their ownership structure and then connect reporting, payables, and data aggregation to it.
This guide covers what the platform includes, the main categories of family office software, how the two models compare, and how to evaluate your options.
Family office platforms at a glance
Category | What it does | Who it fits | Trade-off |
All-in-one suites (Archway, Eton Solutions, FundCount, Asset Vantage) | Accounting, investment reporting, documents, and portals from one vendor | Large offices with complex partnership or trust accounting and a team to run a long rollout | Up to a year to go live; one vendor holds every module |
Aggregation and reporting platforms (Addepar, Masttro, Aleta, Asora, MyFO) | Pull positions on private investments and public holdings from custodians and managers, and report performance and net worth | Offices focused on investment visibility for principals and family members | Most offices still keep a separate set of books |
Accounting-first general ledgers (such as SumIt) | Multi-entity books, intercompany entries, and consolidated reporting | Offices whose daily work sits in the books across many legal structures | Investment performance lives in a connected tool |
Point tools (Bill.com, Ramp, document and CRM tools) | One job each: bill pay, spend, documents, or relationships | Any office, as part of a connected stack | Each one needs a clean connection to the books |
What a family office platform covers
A family office platform covers four areas of work. Some vendors cover all four in one product, and others go deep on one area and connect to the rest.
Multi-entity accounting
Family offices keep books for many legal entities at once: LLCs, trusts, partnerships, corporations, and individuals. In SumIt's data, the median family office on our platform keeps books for 10 entities, the largest runs 224, and about 86% keep books for more than one.
The accounting layer handles each ledger, the intercompany entries between them, and consolidated reporting across the group.
Data aggregation
Data aggregation pulls positions and transactions from custodians, banks, and fund managers into one place, so principals get current visibility into what the family owns.
Aggregation tools cover private investments and public holdings across many asset classes, from real estate to venture funds. Private equity and other private investments take more work to capture, because custodian statements rarely cover them in full.
Investment and performance reporting
Performance reporting calculates returns, benchmarks, and allocations across the portfolio's asset classes. Aggregation platforms such as Addepar handle this work, and it sits close to portfolio management and wealth management.
Documents, workflows, and access
The fourth area covers document management, approval workflows, client portals, and permissions. It controls what family members, advisors, and staff can each see.
The main types of family office software
Family office software vendors fall into four categories, based on the job each product was first built for.
All-in-one platforms
All-in-one platforms combine accounting, investment reporting, document management, and portals in one system. Archway, Eton Solutions, and FundCount sit in this group. Asset Vantage started as an investment reporting tool and added a general ledger later.
These systems handle complex work, including partnership accounting and trust accounting, in one place. Every module has to fit one architecture, so most modules go less deep than a specialist tool built for that job. Implementation can take up to a year, and the team has to learn one large system before it gets value from it.
Aggregation and reporting platforms
Aggregation platforms such as Addepar, Masttro, Aleta, Asora, and MyFO start from investment data. They connect to custodians, calculate performance by asset class, and produce net worth views for the family, often alongside portfolio management and wealth management services.
Some, such as Asora, have added a general ledger, but most offices that use these platforms still keep their official books somewhere else, often in QuickBooks, and reconcile the two.
Accounting-first general ledgers
Accounting-first systems start from the books. They are designed for multi-entity accounting: one login for the whole structure, intercompany entries, eliminations, and consolidated reporting.
SumIt is in this category. We go deep on family office accounting and connect to Addepar for investment reporting and to Bill.com and Ramp for bill pay and spend.
Point tools
Point tools each handle one job. Payables, expense management, document management, and relationship management tools fall here, and a best-of-breed stack combines several of them.
All-in-one vs best-of-breed: which model fits your office
An all-in-one suite gives you one vendor and one system. A best-of-breed stack gives you the best tool in each domain, connected through integrations.
Factor | All-in-one | Best-of-breed |
Scope | Every module in one product | One specialist tool per job |
Depth per module | Shallower, because every module shares one architecture and one roadmap | Each tool is built to be the best in its own domain |
Implementation | Up to a year, because every module goes live together | Each layer goes live on its own timeline |
Risk | Concentrated: all your data and processes sit with one vendor | Spread out: no single vendor holds everything |
Learning curve | One large system that every user has to learn | Each person learns the tool for their own job |
Segregation of duties | Bill pay, accounting, and investment reporting share one system | Each function runs in its own system, with its own access |
When a single suite fits
A single suite fits a large office with complex partnership or trust accounting, a dedicated operations team, and time for a long rollout. It also fits an office that wants one vendor responsible for the whole stack. We often compare an all-in-one suite to a houseboat, which is rarely a great house or a great boat. Each module covers its area with less depth than a tool built only for that job.
When best-of-breed fits
Best-of-breed fits an office that wants depth in each area and is comfortable running several systems. In practice, different people run different parts: the controller works in the books, and the investment team works in the reporting tool. That split also keeps duties separate, so the person who runs bill pay doesn't work inside the investment reporting platform.
When prospects ask us for "one platform," they usually want things to be simple. A connected stack can be simple to run if the integrations are set up properly from the start. It also spreads the risk: if one tool falls behind, the office replaces that tool and keeps the rest.
Why the general ledger decides the rest of the platform
Every other tool in the stack depends on the books. Payables and bank feeds post into them, and reporting and AI tools read from them. If the books can't hold your ownership structure, every connected tool inherits the problem.
Family office structures are rarely simple. In SumIt's data, about 64% of our clients carry three or more entity types in one book of record, and hundreds of entities on the platform are both an owner and owned by another entity. Multi-tier holding chains are common, and the accounting layer has to model them.
Integrations move the work into the books
In a connected stack, integrations do much of the accounting work. In SumIt's data, about 97% of inter-entity journal entries at our multi-entity clients are created by the system: 71% from bank-feed transfer categorization and 26% from bill payments made through Bill.com. Under 3% are typed by hand.
Our clients use these integrations every week. Over the last 90 days, about 83% used bank feeds weekly, about 38% ran Bill.com weekly, and about 26% had Addepar connected. Because the books track which entity owes which, these integrations can post intercompany entries without anyone typing them.
How to evaluate a family office platform
Evaluate family office software against your own structure and the work that takes your team's time. These checks cover what matters in most selections.
Map your structure first
List every legal vehicle, its type, and who owns it, including ownership percentages. Bring that map to every demo and ask the vendor to set it up live.
Focus on the pain points that take most of your time
We recommend picking the three biggest pain points, the ones that take about 80% of your team's time, and choosing the system that solves those. No product covers every need, and 80% to 90% coverage from a vendor with a credible roadmap is a good result.
Test implementation and data migration
Ask how long the implementation takes, who does the data migration, and what you need to provide. Our clients go live in as early as six weeks: you give us read-only access or exports, and our onboarding team maps each chart of accounts and cleans the data with our AI-powered onboarding app.
Check how the tools connect
Ask which integrations exist today, how often they sync, and what happens when a sync fails. Confirm that you can export every transaction across the whole structure into one file, so your data stays yours if you change vendors.
Review security and the audit trail
Ask for the vendor's security documentation, how permissions work per entity, and whether the audit trail records every change, who made it, and which field it touched. A complete audit trail also gives your auditors visibility into how each number got into the books. Our guide to family office technology covers the security layer in more detail.
Ask what the software doesn't do
Ask each vendor to list its gaps. SumIt, for example, does not calculate investment performance metrics such as IRR or TWR (Addepar handles those), and it works in US dollars only until multi-currency support arrives, planned for 2027.
Do the vendor due diligence
Ask about funding sources, client churn, and roadmap priorities. Talk to three clients: one who has used the software for three years, one for two years, and one who just joined.
Look at the people behind the software
Ask whether the team understands family offices. Our team includes CPAs and people who have worked inside family offices, and that experience shapes how SumIt handles intercompany activity and reporting.
Where AI fits in the platform
AI tools now connect to accounting data through the Model Context Protocol (MCP). With an MCP connector, a controller can ask Claude or ChatGPT a question in plain English and get an answer drawn from the live books.
SumIt's MCP connector works this way. The AI sees only what the connecting user can see, and SumIt logs every tool call. A controller can ask, for example, for total legal fees across the whole structure over the last two years. Clients also use it for fund accounting work, such as working through an allocation schedule in Claude with live balances from SumIt.
The answers are only as good as the books the AI reads, so the quality of the accounting layer matters here too.
Frequently asked questions
What is a family office platform?
A family office platform is the software a family office uses to run accounting, investment reporting, and operations across its legal entities. It can be one all-in-one product or a stack of connected tools built around the books.
Should accounting and investment reporting run in the same system?
Many offices keep them in separate specialist tools. That gives each function more depth and keeps duties separate between the accounting, bill pay, and investment teams. SumIt connects to investment reporting tools and brings transactions and investment accounting entries into the general ledger.
How much does family office software cost?
Pricing models differ by vendor, so compare the total cost, including onboarding fees.
Is QuickBooks or Excel enough for a family office?
QuickBooks or Excel can work for a simple structure. Most offices hit the limit at 5 to 10 entities, where 10 entities mean 10 files, 10 logins, and a manual consolidation every close.
Start with the books
If you are comparing family office software, start with the system that will hold your books. SumIt is a general ledger built for family offices, with every entity under one login and integrations with Addepar, Bill.com, and AI tools through MCP.
Talk to us about your structure, or see how SumIt works for single-family offices and multi-family offices. You can also read how we approach multi-entity accounting and strategic integrations.
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