Will I continue to receive Dutch social security benefits after Brexit?

A transition period will be in place until 31 December 2020. During this period, all EU agreements and rules will continue to apply to the UK. So you will still receive Dutch social security benefits in the UK. After 31 December 2020 the situation may change, depending on the agreements made by the UK and the EU, and whether you fall under the withdrawal agreement.

After the transition period

You took up residence in the UK no later than 31 December 2020

If you took up residence in the UK before the end of the transition period, you fall under the withdrawal agreement. This means that nothing will change for you after the transition period. You will continue to receive your benefits as long as your circumstances remain the same.

Coming to the UK after the transition period

If you come to the UK after the transition period, you will not fall under the withdrawal agreement. It is not yet known whether you will still receive your social security benefits. That will depend on the agreements that the EU and the UK make on their future relationship. If no agreements are made, certain social security benefits will no longer be paid out in the UK, or at least not in full.

For more information on exporting social security benefits, see here:

Go to the the Employee Insurance Agency's (UWV) Brexit page for more information on UWV benefits under the following Acts:
Unemployment Insurance Act (WW),
Sickness Benefits Act (ZW), Work and Care Act (WAZO),
Work and Income (Capacity for Work) Act (WIA),
Invalidity Insurance Act (WAO),
Incapacity Insurance (Self-employed Persons) Act (WAZ) and
Work and Employment Support (Young Disabled Persons) Act (WAJONG).

Go to the website of the Social Insurance Bank (SVB) for information on SVB benefits and social insurance: 
General Old Age Pensions Act (AOW),
Surviving Dependants Act (ANW),
child benefit,
international secondment.