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06.01.2020 | Original Research Paper Open Access

Optimal capital injections and dividends with tax in a risk model in discrete time

Zeitschrift:
European Actuarial Journal
Autoren:
Katharina Bata, Hanspeter Schmidli
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Abstract

We consider a risk model in discrete time with dividends and capital injections. The goal is to maximise the value of a dividend strategy. We show that the optimal strategy is of barrier type. That is, all capital above a certain threshold is paid as dividend. A second problem adds tax to the dividends but an injection leads to an exemption from tax. We show that the value function fulfils a Bellman equation. As a special case, we consider the case of premia of size one. In this case we show that the optimal strategy is a two barrier strategy. That is, there is a barrier if a next dividend of size one can be paid without tax and a barrier if the next dividend of size one will be taxed. In both models, we illustrate the findings by de Finetti’s example.

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