Usufruct and bare dominium calculator

This calculator puts a rand value on a usufruct, the right to use a property and take its income for life or for a set period, and on the bare dominium, the ownership that is left when the usufruct is carved out. The arithmetic is prescribed: the regulations under the Estate Duty Act fix the annual value of the right at 12 per cent of the property's value and capitalise it over the holder's life expectancy from a table, or over the fixed period. The calculator applies those tables so that an executor, an heir or a person writing a will can see what the split is worth before SARS or the Master does the sum for them.

It is for anyone dealing with a will that leaves a usufruct to a spouse and the property to the children, for executors valuing an estate in which a usufruct exists or is created, for people weighing whether to leave a usufruct at all, and for anyone selling or donating property subject to one.

What this calculator works out and who it is for

You enter the full market value of the property, whether the usufruct is for the holder's lifetime or for a fixed number of years, and either the holder's age next birthday and sex or the number of years. The calculator returns the annual value of the right at 12 per cent, the capitalisation factor it applied and where it came from, the value of the usufruct, the value of the bare dominium, and the usufruct's share of the whole. It warns about the arithmetic for a young usufructuary, about the age convention, and about the 12 per cent yield where the property cannot earn it.

The same method values a usus, a habitatio, a fideicommissary interest and an annuity charged on property, because the Act treats them alike. The calculator speaks of a usufruct because that is the common case.

How the calculation works

The annual value of the right of enjoyment is 12 per cent of the full value of the property. That is not a guess about what the property earns; it is the figure the regulations prescribe, and it applies to a flat earning six per cent and to a farm earning nothing, unless the Commissioner is persuaded to allow a lower yield for property that cannot reasonably produce 12 per cent.

For a lifetime usufruct, the calculator looks up the holder's age next birthday and sex in Table A, which gives the present value of R1 a year for life at 12 per cent, and multiplies the annual value by that factor. The factor is 8.33 at birth and falls slowly through middle age and then quickly: about 8.13 for a woman of 43, 6.72 for a woman of 66, 3.68 for a woman of 85. Ages above 90 are taken as 90. Men's factors are lower at every age because the table's life expectancies are shorter. The result is capped at the full value of the property, because a usufruct cannot be worth more than the thing it burdens.

For a fixed term, the calculator uses the Table B formula, the present value of R1 a year for the number of years at 12 per cent, which is one minus 1.12 to the power of minus the years, divided by 0.12. Ten years gives 5.65; twenty years gives 7.47.

The bare dominium is simply the full value less the usufruct. The two always add up to the whole.

The law behind the numbers

Section 5(1)(b) of the Estate Duty Act 45 of 1955 provides that the value of a usufructuary or other like interest in property is the amount determined by capitalising, at 12 per cent, the annual value of the right of enjoyment of the property over the expectation of life of the person entitled to the interest, or, if the right is held for a lesser period, over that period. The annual value is 12 per cent of the fair market value of the property, subject to the Commissioner's discretion to allow a lower figure where the property cannot produce it. The regulations issued under section 29, Government Notice R1942 of 23 September 1977, contain Table A, the life expectancy and present value table by age and sex, and Table B, the fixed-period table, and state that age is taken as at the next birthday after the date the right was acquired. The same tables are used for capital gains tax under paragraph 31 of the Eighth Schedule to the Income Tax Act, and SARS reproduces them in its Comprehensive Guide to Capital Gains Tax.

Three consequences follow for an estate. When a testator leaves a usufruct to one person and the bare dominium to another, both are bequests, and both are valued for estate duty on the tables as at the date of death. When the usufructuary dies, section 3(3)(a) deems the value of the property that then accrues to the bare dominium holder to be property in the usufructuary's estate, valued afresh on the tables according to the age of the person who takes it next, or at full value if the usufruct simply falls away to the owner. And when a bare dominium holder dies while the usufruct is still running, only the bare dominium, valued on the tables, is in that estate.

The spousal deduction under section 4(q) applies to a usufruct left to a surviving spouse, which is why the common pattern of usufruct to the spouse and bare dominium to the children defers estate duty on the usufruct portion to the spouse's death. The deferral is real; the eventual duty, calculated on section 3(3)(a) when the spouse dies, often is not what the family expected, and the guide to estate duty deals with that.

The tables are from 1977 and reflect the life expectancies of that time. A woman of 66 today will on average live considerably longer than the 14.5 years the table gives her, which means the tables undervalue a lifetime usufruct relative to reality and overvalue the bare dominium. That cuts both ways in planning, and nobody should assume the table figure is what the right is "really" worth.

Worked example

Johan dies leaving a house worth R2 000 000 to his two children subject to a lifetime usufruct in favour of his wife Marietjie, who will turn 66 on her next birthday.

The annual value of the right is 12 per cent of R2 000 000, which is R240 000. Table A gives a woman aged 66 a factor of 6.72393. The usufruct is worth R240 000 multiplied by 6.72393, which is R1 613 743.20, or about 81 per cent of the house. The bare dominium passing to the children is R386 256.80 between them. For estate duty, the usufruct is deductible as a bequest to a spouse; the children's bare dominium is dutiable in Johan's estate at R386 256.80, which after the abatement means no duty in this estate on its own.

When Marietjie dies, say at 82, the children's bare dominium becomes full ownership. Section 3(3)(a) deems the value of the house at that date, less nothing because the usufruct simply falls away, to be property in her estate: if the house is then worth R3 500 000, that full R3 500 000 is in her dutiable estate, against her own abatement and anything Johan's estate did not use. The children received R386 256.80 of value on paper in 2026 and R3 500 000 of duty exposure in Marietjie's estate years later. That is the arithmetic the calculator's warning about young usufructuaries is pointing at, in a milder form.

Had Johan instead left the usufruct for a fixed ten years, the factor would be 5.65022, the usufruct R1 356 052.80, and the bare dominium R643 947.20, and there would be no section 3(3)(a) consequence when it ended, because it would end by time rather than by death.

What the calculator does not include

It does not value the property. The full market value is your input, and for estate duty it is the value an executor supports with a valuation.

It does not apply the Commissioner's discretion to use a yield below 12 per cent, which must be applied for and motivated.

It does not calculate the estate duty, capital gains tax or transfer duty that follow from the values. The executor fees and estate duty calculator deals with duty; the CGT consequences of a usufruct, including the base cost split, need a practitioner.

It does not deal with a usufruct over a share portfolio or a business, where the annual value question is live, or with a right of habitatio over part of a property.

It does not model section 3(3)(a) at the usufructuary's death, which depends on who takes the property and their age at that time.

When to get advice

Use the calculator to understand the split; use an attorney or fiduciary practitioner before putting a usufruct in a will. A usufruct protects a spouse's home and income and defers duty, but it ties the children to the property for the spouse's lifetime, it complicates any sale, bond or renovation, because the usufructuary and the bare dominium holders must all agree, and it can produce a large duty bill in the spouse's estate. Alternatives include a testamentary trust, an outright bequest with a life right of occupation agreed separately, or life insurance to fund the duty. Executors should have the tables applied by the practitioner preparing the account, and heirs who are offered a sum to "buy out" a usufruct should know what the tables say before they agree.

Frequently asked questions

How is a usufruct valued? At 12 per cent of the property's value a year, capitalised over the holder's life expectancy using Table A under the Estate Duty Act regulations, or over the fixed period using Table B. The calculator applies both.

What is bare dominium worth? The full value of the property less the value of the usufruct. For a 66-year-old female usufructuary it is about 19 per cent of the property; for a 40-year-old it is about two per cent.

Does the 12 per cent apply even if the property earns less? Yes, unless the Commissioner agrees that the property cannot reasonably produce 12 per cent and allows a lower yield. That has to be applied for.

Is a usufruct to my spouse free of estate duty? It qualifies for the spousal deduction in your estate. The property then falls into your spouse's estate when the usufruct ends at their death, under section 3(3)(a), at its value then.

What age do I use? The holder's age next birthday on the date the right was acquired, which for a will is the date of death. Ages above 90 are taken as 90.

Do the same tables apply for capital gains tax? Yes. Paragraph 31 of the Eighth Schedule uses the same method and SARS publishes the same tables in its CGT guide.

Can a usufruct be worth more than the property? No. The calculator caps the usufruct at the full value, which the table only approaches for the very young.