Dutch term (edited): WIA-vervolguitkering; WGA-vervolguitkering

See my reference comment and see also below.

During the first two years of your illness, you and your employer work together to get you back to work as soon as possible. This is something the law requires you to do. Has your occupational disability made it impossible for you to return to work at your full capacity within two years? If so, you will have to deal with the WIA.

There are four possibilities:
1. You are less than 35% occupationally disabled
2. You are partially occupationally disabled (35%-80%)
3. You are fully (80% or more) but not permanently occupationally disabled
4. You are fully (80% or more) and permanently occupationally disabled

(...)

2. You are partially occupationally disabled (35%-80%)
You can continue to do part of your work. You are subject to the “WGA” referred to above. This the Dutch Resumption of Work (Partially Fit Persons) Regulation [regeling Werkhervatting Gedeeltelijk Arbeidsgeschikten] and you receive a limited statutory benefit.

First phase

For the first months (for at least 3 but no more than 24 months), you receive a WGA salary-linked benefit, provided that you worked long enough prior to your first sick day. The duration of a disability benefit is linked to the duration of your employment history. For the first two months, that benefit equals 75%, and then 70% after those two months, of your former salary, up to a certain maximum,1 less 70% of your new salary.

Second phase

After the first phase, you receive a limited benefit. The amount of that benefit depends on whether you are actually earning what the UWV (the Employees’ Insurance Agency) says you are able to earn; this is referred to as your “remaining earning capacity”. There are two possibilities:

a) You are earning less than half of your remaining earning capacity. You receive a low benefit: the WGA follow-up benefit. This is only a percentage of the minimum wage, which usually means a substantial loss of income.

b) You are earning at least 50% of your remaining earning capacity.
You receive the higher WGA supplemental benefit [WGA loonaanvullingsuitkering].
That benefit partially supplements (70%) the difference between your former income and the income that the UWV decides you are able to earn. If you are unsuccessful in earning an amount equal to your remaining earning capacity, your income loss will be even more significant. This will also mean a substantial income loss, even if that loss will be smaller than you would incur when receiving the WGA follow-up benefit.

Both the WGA supplemental benefit and the WGA follow-up benefit are only paid out until you reach the retirement age defined in the Dutch State Pension Act [AOW] (this age is referred to below as the “AOW age”).

Over the course of time, are you doing so well that you are earning 65% or more of the salary you were making before your illness? If so, you will stop receiving your benefit.
http://werknemer.wiametalektro.nl/wp-content/uploads/2017/06...

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Note added at 14 hrs (2017-09-04 10:47:31 GMT)
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@Michael: I can understand your confusion but "WIA-vervolguitkering" and "WGA-vervolguitkering" are quite simply the same thing. The "vervolguitkering" only applies to the "WGA" and not to the "IVA" .