Solution
Code for main template:
{% ic %}{::infotext}Values from this reconciliation are referred to in other templates{:/infotext}{% endic %}
*Vat obligated?* {% input custom.tax.check as:boolean %}
{% stripnewlines %}
| Vat declaration
| VAT deductible
| VAT due
| VAT total
{% newline %}
|------
|------:
|------:
|------:+
{% newline %}
{% fori tax in custom.taxes %}
| {% input tax.information %}
| {% =$1+input tax.deductible as:currency %}
| {% =$2+input tax.due as:currency %}
| {{ tax.deductible+tax.due }}
{% newline %}
{% endfori %}
|_^ ^_
|_^ {{ $1 | currency }} ^_
|_^ {{ $2 | currency }} ^_
|_^ {% =$0+ $1-$2 %} ^_
{% endstripnewlines %}
{% result 'total_vat' $0 %}
Code of the second reconciliation template with text:
{{ company.name }} is {% if period.reconciliations.vat_declaration.custom.tax.check != true %}non{% endif %} VAT obligated{% if period.reconciliations.vat_declaration.custom.tax.check == true %}; in bookyear {{ period.end_date | date:"%Y" }} they had {{ period.reconciliations.vat_declaration.results.total_vat | currency_dc }} due.{% else %}.{% endif %}
Solution using HTML Tables:
{% ic %}{::infotext}Values from this reconciliation are referred to in other templates{:/infotext}{% endic %}
*Vat obligated?* {% input custom.tax.check as:boolean %}
<table class="usr-width-100">
<thead>
<tr>
<th class="usr-line-bottom"><b>Vat declaration</b></th>
<th class="usr-line-bottom usr-align-right"><b>VAT deductible</b></th>
<th class="usr-line-bottom usr-align-right"><b>VAT due</b></th>
<th class="usr-line-bottom usr-align-right"><b>VAT total</b></th>
</tr>
</thead>
<tbody>
{% fori tax in custom.taxes %}
<tr>
<td class="">{% input tax.information %}</td>
<td class="usr-align-right">{% input tax.deductible as:currency %}{% assign tax_deductible = tax_deductible+tax.deductible %}</td>
<td class="usr-align-right">{% input tax.due as:currency %}{% assign tax_due = tax_due+tax.due %}</td>
<td class="usr-align-right">{{ tax.deductible+tax.due }}</td>
</tr>
{% endfori %}
<tr>
<td class="usr-line-top usr-line-bottom"></td>
<td class="usr-line-top usr-line-bottom usr-align-right"><b>{{ tax_deductible | currency }}</b></td>
<td class="usr-line-top usr-line-bottom usr-align-right"><b>{{ tax_deductible | currency }}</b></td>
<td class="usr-line-top usr-line-bottom usr-align-right"><b>{% assign total_tax = tax_deductible+tax_due %}{% =$0+ $1-$2 %}</b></td>
</tr>
</tbody>
</table>
{% result 'total_vat' total_tax %}