Personal Umbrella Liability Sizer
Size a personal umbrella policy (excess liability sitting above your auto + homeowners) by net-worth tier × risk multipliers (pool / dog / teen driver / rental property). Verifies the underlying-limit prerequisites typical carriers require, plus estimated annual premium. Cited to ISO (Insurance Services Office) Personal Umbrella Liability Policy form, Insurance Information Institute (III), Insurance Research Council.
Estimated annual premium: $468 ($330–$715 range)
Recommended $2M umbrella, composed of: $1M from net-worth tier + $500K for risk factors (1 flagged) (raw recommendation $1.5M, rounded up to the nearest available tier).
- Net-worth tier base
- $1M
- Future-earnings addition
- $0
- Risk-factor addition
- $500K
- Cost per $1M
- $234/yr
- Auto BI per-accident$500K / need $250K ✓
- Auto PD$250K / need $100K ✓
- Homeowners liability$500K / need $300K ✓
View the TypeScript implementation on GitHub: packages/calc/src/personal-umbrella-sizer.ts · view tests
What this means
An umbrella sits ON TOP of underlying auto + homeowners liability. When a judgment exceeds the underlying limit, the umbrella picks up the rest — up to the umbrella tier. A $1M umbrella with $500K underlying auto BI covers a $1.4M judgment fully; the $500K underlying pays first, the $900K excess hits the umbrella, the last $500K of umbrella absorbs it. Anything above $1.5M total ($500K + $1M) drops onto the household's personal balance sheet.
The underlying-prerequisite test matters because the umbrella always pays excess of underlying — never instead of. If underlying is below the carrier's prerequisite, two problems compound: the umbrella may be non-renewed, AND any claim above the inadequate underlying creates a gap the umbrella cannot fill (the prerequisite limit, not the actual underlying limit, is what the umbrella attaches above on most policy forms).
Worked example
A household with $750K net worth, $175K income, two dependents, a dog (no pool, no teen driver, no rental property), and current underlying limits of 500/250/$500K homeowners gets: net-worth base $1M (under $1M tier) + future-earnings $0 (income under threshold) + risk factors $500K (dog) = raw recommendation $1.5M, rounds up to $2M umbrella. Estimated annual premium ~$425. Underlying prerequisites all met. Cost per $1M of coverage: ~$215/year.
Frequently asked questions
The information and tools on this website are for general educational purposes only and do not constitute financial, investment, legal, or tax advice. Consult a licensed professional for decisions specific to your situation.