diff --git a/account_us_wa_salestax/__init__.py b/account_us_wa_salestax/__init__.py
new file mode 100644
index 00000000..0650744f
--- /dev/null
+++ b/account_us_wa_salestax/__init__.py
@@ -0,0 +1 @@
+from . import models
diff --git a/account_us_wa_salestax/__manifest__.py b/account_us_wa_salestax/__manifest__.py
new file mode 100644
index 00000000..3bf44876
--- /dev/null
+++ b/account_us_wa_salestax/__manifest__.py
@@ -0,0 +1,13 @@
+{'name': 'US WA State SalesTax API',
+ 'version': '10.0.1.0.0',
+ 'category': 'Tools',
+ 'depends': ['account',
+             ],
+ 'author': 'Hibou Corp.',
+ 'license': 'AGPL-3',
+ 'website': 'https://hibou.io/',
+ 'data': ['views/account_fiscal_position_view.xml',
+          ],
+ 'installable': True,
+ 'application': False,
+ }
diff --git a/account_us_wa_salestax/models/__init__.py b/account_us_wa_salestax/models/__init__.py
new file mode 100644
index 00000000..d0e78197
--- /dev/null
+++ b/account_us_wa_salestax/models/__init__.py
@@ -0,0 +1,2 @@
+from . import account_fiscal_position
+from . import wa_tax_request
diff --git a/account_us_wa_salestax/models/account_fiscal_position.py b/account_us_wa_salestax/models/account_fiscal_position.py
new file mode 100644
index 00000000..cdaa0738
--- /dev/null
+++ b/account_us_wa_salestax/models/account_fiscal_position.py
@@ -0,0 +1,78 @@
+from odoo import api, fields, models
+from odoo.exceptions import ValidationError
+
+from .wa_tax_request import WATaxRequest
+
+
+class AccountFiscalPosition(models.Model):
+    _inherit = 'account.fiscal.position'
+
+    is_us_wa = fields.Boolean(string='Use WA State API')
+    wa_base_tax_id = fields.Many2one('account.tax', string='WA Base/Error Tax')
+
+    @api.multi
+    def map_tax(self, taxes, product=None, partner=None):
+
+        if not taxes or not self.is_us_wa or partner is None:
+            return super(AccountFiscalPosition, self).map_tax(taxes)
+
+        AccountTax = self.env['account.tax'].sudo()
+        result = AccountTax.browse()
+
+        for tax in taxes:
+            # step 1: If we were to save the location code on the partner we might not have to do this
+            request = WATaxRequest()
+            res = request.get_rate(partner)
+            wa_tax = None
+            if not request.is_success(res):
+                # Cache.
+                wa_tax = AccountTax.search([
+                    ('wa_location_zips', 'like', '%' + partner.zip + '%'),
+                    ('amount_type', '=', 'percent'),
+                    ('type_tax_use', '=', 'sale')], limit=1)
+                if not wa_tax:
+                    result |= self.wa_base_tax_id
+                    continue
+
+            # step 2: Find or create tax
+            if not wa_tax:
+                wa_tax = AccountTax.search([
+                    ('wa_location_code', '=', res['location_code']),
+                    ('amount', '=', res['rate']),
+                    ('amount_type', '=', 'percent'),
+                    ('type_tax_use', '=', 'sale')], limit=1)
+            if not wa_tax:
+                wa_tax = AccountTax.create({
+                    'name': '%s - WA Tax %s %%' % (res['location_code'], res['rate']),
+                    'wa_location_code': res['location_code'],
+                    'amount': res['rate'],
+                    'amount_type': 'percent',
+                    'type_tax_use': 'sale',
+                    'account_id': self.wa_base_tax_id.account_id.id,
+                    'refund_account_id': self.wa_base_tax_id.refund_account_id.id
+                })
+
+            if not wa_tax.wa_location_zips:
+                wa_tax.wa_location_zips = partner.zip
+            elif not wa_tax.wa_location_zips.find(partner.zip) >= 0:
+                zips = wa_tax.wa_location_zips.split(',')
+                zips.append(partner.zip)
+                wa_tax.wa_location_zips = zips.append(',')
+
+            # step 3: Find or create mapping
+            tax_line = self.tax_ids.filtered(lambda x: x.tax_src_id.id == tax.id and x.tax_dest_id.id == wa_tax.id)
+            if not tax_line:
+                tax_line = self.env['account.fiscal.position.tax'].sudo().create({
+                    'position_id': self.id,
+                    'tax_src_id': tax.id,
+                    'tax_dest_id': wa_tax.id,
+                })
+
+            result |= tax_line.tax_dest_id
+        return result
+
+class AccountTax(models.Model):
+    _inherit = 'account.tax'
+
+    wa_location_code = fields.Integer('WA Location Code')
+    wa_location_zips = fields.Char('WA Location ZIPs', default='')
diff --git a/account_us_wa_salestax/models/wa_tax_request.py b/account_us_wa_salestax/models/wa_tax_request.py
new file mode 100644
index 00000000..e9f0242f
--- /dev/null
+++ b/account_us_wa_salestax/models/wa_tax_request.py
@@ -0,0 +1,74 @@
+from urllib.request import urlopen, quote
+from urllib.error import HTTPError
+from ssl import _create_unverified_context
+from logging import getLogger
+
+from odoo.exceptions import ValidationError
+
+_logger = getLogger(__name__)
+
+
+class WATaxRequest(object):
+    def __init__(self):
+        pass
+
+    def get_rate(self, partner):
+        # https://webgis.dor.wa.gov/webapi/addressrates.aspx/?output=text\&addr=test\&city=Marysville\&zip=98270
+        if not all((partner.street, partner.city, partner.zip)):
+            raise ValidationError('WATaxRequest impossible without Street, City and ZIP.')
+        url = 'https://webgis.dor.wa.gov/webapi/addressrates.aspx?output=text&addr=' + quote(partner.street) + \
+            '&city=' + quote(partner.city) + '&zip=' + quote(partner.zip)
+        _logger.info(url)
+        try:
+            response = urlopen(url, context=_create_unverified_context())
+            response_body = response.read()
+            _logger.info(response_body)
+        except HTTPError as e:
+            _logger.warn('Error on request: ' + str(e))
+            response_body = ''
+
+        return self._parse_rate(response_body)
+
+    def is_success(self, result):
+        '''
+            ADDRESS = 0,
+            LATLON = 0,
+            PLUS4 = 1,
+            ADDRESS_STANARDIZED = 2,
+            PLUS4_STANARDIZED = 3,
+            ADDRESS_CHANGED = 4,
+            ZIPCODE = 5,
+            ADDRESS_NOT_FOUND = 6,
+            LATLON_NOT_FOUND = 7,
+            POI = 8,
+            ERROR = 9
+            internal parse_error = 100
+        '''
+        if 'result_code' not in result or result['result_code'] >= 9 or result['result_code'] < 0:
+            return False
+        return True
+
+    def _parse_rate(self, response_body):
+        # 'LocationCode=1704 Rate=0.100 ResultCode=0'
+        # {
+        #   'result_code': 0,
+        #   'location_code': '1704',
+        #   'rate': '10.00',
+        # }
+
+        res = {'result_code': 100}
+        if len(response_body) > 200:
+            # this likely means that they returned an HTML page
+            return res
+
+        body_parts = response_body.decode().split(' ')
+        for part in body_parts:
+            if part.find('ResultCode=') >= 0:
+                res['result_code'] = int(part[len('ResultCode='):])
+            elif part.find('Rate=') >= 0:
+                res['rate'] = '%.2f' % (float(part[len('Rate='):]) * 100.0)
+            elif part.find('LocationCode=') >= 0:
+                res['location_code'] = part[len('LocationCode='):]
+            elif part.find('debughint=') >= 0:
+                res['debug_hint'] = part[len('debughint='):]
+        return res
diff --git a/account_us_wa_salestax/views/account_fiscal_position_view.xml b/account_us_wa_salestax/views/account_fiscal_position_view.xml
new file mode 100644
index 00000000..59ae7989
--- /dev/null
+++ b/account_us_wa_salestax/views/account_fiscal_position_view.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+    <record id="account_position_us_wa_inherit_from_view" model="ir.ui.view">
+        <field name="name">account.fiscal.position.form.inherit</field>
+        <field name="model">account.fiscal.position</field>
+        <field name="inherit_id" ref="account.view_account_position_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='active']" position="after">
+                <field name="is_us_wa"/>
+                <field name="wa_base_tax_id" attrs="{'invisible': [('is_us_wa', '=', False)]}" />
+            </xpath>
+        </field>
+    </record>
+
+    <record id="view_tax_form" model="ir.ui.view">
+        <field name="name">account.tax.form.inherit</field>
+        <field name="model">account.tax</field>
+        <field name="inherit_id" ref="account.view_tax_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='description']" position="after">
+                <field name="wa_location_code" />
+                <field name="wa_location_zips" />
+            </xpath>
+        </field>
+    </record>
+
+</odoo>