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duo-rekentool

v1.2.0

Published

Plugin to calculate student debt for Dutch students

Readme

DUO Rekentool

WIKI

Rente (SF35)

  • Wordt vastgezet voor periodes van 5 jaar, startend vanaf de aanloopfase.
  • Gelijk aan de gemiddelde rente op de vijfjaarsobligaties in de periode oktober tot en met september.

Draagkracht berekening (SF35)

  • Onder de 5 euro hoeft er niet betaald te worden.
  • Maximaal 4% van de draagkrachtvrije voet.
  • Draagkrachtvrije voet is:
    • 100% van het minimum inkomen als alleenstaand zonder kinderen.
    • 143% van het minimum inkomen anders.
  • Peiljaar: inkomen van 2 jaar geleden.
  • Wanneer de draagkracht lager is dan het wettelijk maandbedrag wordt het maandbedrag verlaagd. Dit is gelding voor 1 kalender jaar.

Berekening restschuld ($S$)

S=
\begin{dcases}
    S_0 (1+r)^k - A\frac{(1 + r)^{k} - 1}{r} &\text{als } r>0\\
    S_0 - A k &\text{anders}
\end{dcases},

waar $S_0$ is de initiele schuld, $A$ is de annuïteit, $r$ is de rente en $k$ is de looptijd.

Berekening annuïteit ($A$)

A=
\begin{dcases}
    S^0 \frac{r(1+r)^k}{(1+r)^{k} - 1} &\text{als } r>0\\
    S^0 / k &\text{anders}
\end{dcases},

waar $S_0$ is de initiele schuld, $r$ is de rente en $k$ is de looptijd.

Berekening draagkracht ($D$)

D = 
\begin{dcases}
    0 &\text{als } I \leq I_{\text{min}}\\
    100\% \cdot(I - I_{\text{min}}) \cdot 4\% &\text{als alleenstaand zonder kinderen}\\
    143\% \cdot(I - I_{\text{min}}) \cdot 4\% &\text{anders }\\
\end{dcases},

waar $I$ is het inkomen en $I_{\text{min}}$ het minimumloon.

Berekening maandbedrag ($M$)

M= 
\begin{dcases}
    0 &\text{als } D < 5\\
    \min\{A, D\} &\text{anders }\\
\end{dcases},

waar $\min{\cdot}$ is het minimum van de twee waarden.